Get system messages for Microsoft Teams using Microsoft Graph APIs

Microsoft Teams generates system messages for events such as members added to a chat, team name updated, and channel description updated. System messages enable the caller to have insights about events that happened in a team, a channel, or a chat.

Microsoft Graph exposes system messages as part of chatMessage GET operations and Change notifications for chat and channel messages.

System messages are presented as chatMessage objects. In this case, the messageType property is set to systemEventMessage and the eventDetail property provides the event details.

Supported GET operations

The following GET operations support system messages:

  • GET /teams/{team-id}/channels/{channel-id}/messages
  • GET /teams/{team-td}/channels/{channel-id}/messages/{message-id}
  • GET /chats/{chat-id}/messages
  • GET /chats/{chat-id}/messages/{message-id}

For details, see chatMessage.

Supported change notifications

The following change notifications support system messages:

  • Subscribe to messages in a channel - /teams/{team-id}/channels/{channel-id}/messages
  • Subscribe to messages in a chat - /chats/{chat-id}/messages

For details, see Change notifications for messages.

Supported system message events

Event System message type Applicable to
Call ended callEndedEventMessageDetail Chat, Channel
Call recording callRecordingEventMessageDetail Chat, Channel
Call started callStartedEventMessageDetail Chat, Channel
Call transcript callTranscriptEventMessageDetail Chat, Channel
Channel added channelAddedEventMessageDetail Team
Channel deleted channelDeletedEventMessageDetail Team
Channel description updated channelDescriptionUpdatedEventMessageDetail Channel
Channel renamed channelRenamedEventMessageDetail Channel
Channel set as favorite channelSetAsFavoriteByDefaultEventMessageDetail Channel
Channel unset as favorite channelUnsetAsFavoriteByDefaultEventMessageDetail Channel
Chat renamed chatRenamedEventMessageDetail Chat
Conversation member role updated conversationMemberRoleUpdatedEventMessageDetail Channel, Team
Meeting policy updated meetingPolicyUpdatedEventMessageDetail Chat
Members added membersAddedEventMessageDetail Chat, Channel, Team
Members deleted membersDeletedEventMessageDetail Chat, Channel, Team
Members joined membersJoinedEventMessageDetail Chat
Members left membersLeftEventMessageDetail Chat
Tab updated tabUpdatedEventMessageDetail Chat, Channel
Team archived teamArchivedEventMessageDetail Team
Team created teamCreatedEventMessageDetail Team
Team description updated teamDescriptionUpdatedEventMessageDetail Team
Team joining disabled teamJoiningDisabledEventMessageDetail Team
Team joining enabled teamJoiningEnabledEventMessageDetail Team
Team renamed teamRenamedEventMessageDetail Team
Teams app installed teamsAppInstalledEventMessageDetail Chat, Channel, Team
Teams app removed teamsAppRemovedEventMessageDetail Chat, Channel, Team
Teams app upgraded teamsAppUpgradedEventMessageDetail Chat, Channel, Team
Team unarchived teamUnarchivedEventMessageDetail Team

Note: System messages applicable to a team are posted in the primary channel.

JSON response examples

The following JSON examples show the responses for each supported event type.

Call ended

{
  "id": "1616883610266",
  "replyToId": null,
  "etag": "1616883610266",
  "messageType": "systemEventMessage",
  "createdDateTime": "2021-03-28T03:50:10.266Z",
  "lastModifiedDateTime": "2021-03-28T03:50:10.266Z",
  "lastEditedDateTime": null,
  "deletedDateTime": null,
  "subject": null,
  "summary": null,
  "chatId": null,
  "importance": "normal",
  "locale": "en-us",
  "webUrl": "https://teams.microsoft.com/l/message/19%3A4a95f7d8db4c4e7fae857bcebe0623e6%40thread.tacv2/1616883610266?groupId=fbe2bf47-16c8-47cf-b4a5-4b9b187c508b&tenantId=2432b57b-0abd-43db-aa7b-16eadd115d34&createdTime=1616883610266&parentMessageId=1616883610266",
  "policyViolation": null,
  "from": null,
  "body": {
    "contentType": "html",
    "content": "<systemEventMessage/>"
  },
  "channelIdentity": {
    "teamId": "fbe2bf47-16c8-47cf-b4a5-4b9b187c508b",
    "channelId": "19:4a95f7d8db4c4e7fae857bcebe0623e6@thread.tacv2"
  },
  "onBehalfOf": null,
  "attachments": [],
  "mentions": [],
  "reactions": [],
  "eventDetail": {
    "@odata.type": "#microsoft.graph.callEndedEventMessageDetail",
    "callId": "9c848c0e-f906-4dfc-b22e-c68a785a587c",
    "callDuration": "PT59S",
    "callEventType": "meeting",
    "callParticipants": [{
      "participant": {
        "application": null,
        "device": null,
        "user": {
          "id": "1fb8890f-423e-4154-8fbf-db6809bc8756",
          "displayName": "Adele Vance ",
          "userIdentityType": "aadUser"
        }
      }
    }],
    "initiator": {
      "application": null,
      "device": null,
      "user": {
        "id": "1fb8890f-423e-4154-8fbf-db6809bc8756",
        "displayName": null,
        "userIdentityType": "aadUser"
      }
    }
  }
}

Call recording

{
  "id": "1616883610266",
  "replyToId": null,
  "etag": "1616883610266",
  "messageType": "systemEventMessage",
  "createdDateTime": "2021-03-28T03:50:10.266Z",
  "lastModifiedDateTime": "2021-03-28T03:50:10.266Z",
  "lastEditedDateTime": null,
  "deletedDateTime": null,
  "subject": null,
  "summary": null,
  "chatId": null,
  "importance": "normal",
  "locale": "en-us",
  "webUrl": "https://teams.microsoft.com/l/message/19%3A4a95f7d8db4c4e7fae857bcebe0623e6%40thread.tacv2/1616883610266?groupId=fbe2bf47-16c8-47cf-b4a5-4b9b187c508b&tenantId=2432b57b-0abd-43db-aa7b-16eadd115d34&createdTime=1616883610266&parentMessageId=1616883610266",
  "policyViolation": null,
  "from": null,
  "body": {
    "contentType": "html",
    "content": "<systemEventMessage/>"
  },
  "channelIdentity": {
    "teamId": "fbe2bf47-16c8-47cf-b4a5-4b9b187c508b",
    "channelId": "19:4a95f7d8db4c4e7fae857bcebe0623e6@thread.tacv2"
  },
  "onBehalfOf": null,
  "attachments": [],
  "mentions": [],
  "reactions": [],
  "eventDetail": {
    "@odata.type": "#microsoft.graph.callRecordingEventMessageDetail",
    "callId": "c86c6052-410b-4e7c-b843-9a09f576e4d5",
    "callRecordingDisplayName": "Meeting Recording.mp4",
    "callRecordingUrl": "https://testtenant.sharepoint.com/sites/TestTeam/Shared%20Documents/General/Recordings/Meeting%20Recording.mp4?web=1",
    "callRecordingDuration": "PT40M19.26S",
    "callRecordingStatus": "success",
    "meetingOrganizer": {
      "application": null,
      "device": null,
      "user": {
        "id": "1fb8890f-423e-4154-8fbf-db6809bc8756",
        "displayName": null,
        "userIdentityType": "aadUser"
      }
    },
    "initiator": {
      "application": null,
      "device": null,
      "user": {
        "id": "1fb8890f-423e-4154-8fbf-db6809bc8756",
        "displayName": null,
        "userIdentityType": "aadUser"
      }
    }
  }
}

Call started

{
  "id": "1615943825123",
  "replyToId": null,
  "etag": "1615943825123",
  "messageType": "systemEventMessage",
  "createdDateTime": "2021-03-1706:47:05.123Z",
  "lastModifiedDateTime": "2021-03-1706:47:05.123Z",
  "lastEditedDateTime": null,
  "deletedDateTime": null,
  "subject": null,
  "summary": null,
  "chatId": "19:2da4c29f6d7041eca70b638b43d45437@thread.v2",
  "importance": "normal",
  "locale": "en-us",
  "webUrl": null,
  "channelIdentity": null,
  "onBehalfOf": null,
  "policyViolation": null,
  "from": null,
  "body": {
    "contentType": "html",
    "content": "<systemEventMessage/>"
  },
  "attachments": [],
  "mentions": [],
  "reactions": [],
  "eventDetail": {
    "@odata.type": "#microsoft.graph.callStartedEventMessageDetail",
    "callId": "9c848c0e-f906-4dfc-b22e-c68a785a587c",
    "callEventType": "call",
    "initiator": {
      "application": null,
      "device": null,
      "user": {
        "id": "1fb8890f-423e-4154-8fbf-db6809bc8756",
        "displayName": null,
        "userIdentityType": "aadUser"
      }
    }
  }
}

Call transcript

{
  "id": "1615943825123",
  "replyToId": null,
  "etag": "1615943825123",
  "messageType": "systemEventMessage",
  "createdDateTime": "2021-03-1706:47:05.123Z",
  "lastModifiedDateTime": "2021-03-1706:47:05.123Z",
  "lastEditedDateTime": null,
  "deletedDateTime": null,
  "subject": null,
  "summary": null,
  "chatId": "19:2da4c29f6d7041eca70b638b43d45437@thread.v2",
  "importance": "normal",
  "locale": "en-us",
  "webUrl": null,
  "channelIdentity": null,
  "onBehalfOf": null,
  "policyViolation": null,
  "from": null,
  "body": {
    "contentType": "html",
    "content": "<systemEventMessage/>"
  },
  "attachments": [],
  "mentions": [],
  "reactions": [],
  "eventDetail": {
    "@odata.type": "#microsoft.graph.callTranscriptEventMessageDetail",
    "callId": "5b927778-760b-429e-8c4e-65b1802dd6c9",
    "callTranscriptICalUid": "040000008200E00074C5B7101A82E00800000000002C743F89CDD601000000000000000010000000CA87F90D9372ED45A399B5D75E854EE9 ",
    "meetingOrganizer": {
      "application": null,
      "device": null,
      "user": {
        "id": "1fb8890f-423e-4154-8fbf-db6809bc8756",
        "displayName": null,
        "userIdentityType": "aadUser"
      }
    }
  }
}

Channel added

{
  "id": "1616883610266",
  "replyToId": null,
  "etag": "1616883610266",
  "messageType": "systemEventMessage",
  "createdDateTime": "2021-03-28T03:50:10.266Z",
  "lastModifiedDateTime": "2021-03-28T03:50:10.266Z",
  "lastEditedDateTime": null,
  "deletedDateTime": null,
  "subject": null,
  "summary": null,
  "chatId": null,
  "importance": "normal",
  "locale": "en-us",
  "webUrl": "https://teams.microsoft.com/l/message/19%3A4a95f7d8db4c4e7fae857bcebe0623e6%40thread.tacv2/1616883610266?groupId=fbe2bf47-16c8-47cf-b4a5-4b9b187c508b&tenantId=2432b57b-0abd-43db-aa7b-16eadd115d34&createdTime=1616883610266&parentMessageId=1616883610266",
  "policyViolation": null,
  "from": null,
  "body": {
    "contentType": "html",
    "content": "<systemEventMessage/>"
  },
  "channelIdentity": {
    "teamId": "fbe2bf47-16c8-47cf-b4a5-4b9b187c508b",
    "channelId": "19:4a95f7d8db4c4e7fae857bcebe0623e6@thread.tacv2"
  },
  "onBehalfOf": null,
  "attachments": [],
  "mentions": [],
  "reactions": [],
  "eventDetail": {
    "@odata.type": "#microsoft.graph.channelAddedEventMessageDetail",
    "channelId": "19:e84f079882f44fa8bebb7343b9e8921a@thread.tacv2",
    "channelDisplayName": "Standard channel",
    "initiator": {
      "application": null,
      "device": null,
      "user": {
        "id": "1fb8890f-423e-4154-8fbf-db6809bc8756",
        "displayName": null,
        "userIdentityType": "aadUser"
      }
    }
  }
}

Channel deleted

{
  "id": "1616883610266",
  "replyToId": null,
  "etag": "1616883610266",
  "messageType": "systemEventMessage",
  "createdDateTime": "2021-03-28T03:50:10.266Z",
  "lastModifiedDateTime": "2021-03-28T03:50:10.266Z",
  "lastEditedDateTime": null,
  "deletedDateTime": null,
  "subject": null,
  "summary": null,
  "chatId": null,
  "importance": "normal",
  "locale": "en-us",
  "webUrl": "https://teams.microsoft.com/l/message/19%3A4a95f7d8db4c4e7fae857bcebe0623e6%40thread.tacv2/1616883610266?groupId=fbe2bf47-16c8-47cf-b4a5-4b9b187c508b&tenantId=2432b57b-0abd-43db-aa7b-16eadd115d34&createdTime=1616883610266&parentMessageId=1616883610266",
  "policyViolation": null,
  "from": null,
  "body": {
    "contentType": "html",
    "content": "<systemEventMessage/>"
  },
  "channelIdentity": {
    "teamId": "fbe2bf47-16c8-47cf-b4a5-4b9b187c508b",
    "channelId": "19:4a95f7d8db4c4e7fae857bcebe0623e6@thread.tacv2"
  },
  "onBehalfOf": null,
  "attachments": [],
  "mentions": [],
  "reactions": [],
  "eventDetail": {
    "@odata.type": "#microsoft.graph.channelDeletedEventMessageDetail",
    "channelId": "19:914b8c83915548c0bff588e510a6cf01@thread.tacv2",
    "channelDisplayName": "Standard channel",
    "initiator": {
      "application": null,
      "device": null,
      "user": {
        "id": "1fb8890f-423e-4154-8fbf-db6809bc8756",
        "displayName": null,
        "userIdentityType": "aadUser"
      }
    }
  }
}

Channel description updated

{
  "id": "1616883610266",
  "replyToId": null,
  "etag": "1616883610266",
  "messageType": "systemEventMessage",
  "createdDateTime": "2021-03-28T03:50:10.266Z",
  "lastModifiedDateTime": "2021-03-28T03:50:10.266Z",
  "lastEditedDateTime": null,
  "deletedDateTime": null,
  "subject": null,
  "summary": null,
  "chatId": null,
  "importance": "normal",
  "locale": "en-us",
  "webUrl": "https://teams.microsoft.com/l/message/19%3A4a95f7d8db4c4e7fae857bcebe0623e6%40thread.tacv2/1616883610266?groupId=fbe2bf47-16c8-47cf-b4a5-4b9b187c508b&tenantId=2432b57b-0abd-43db-aa7b-16eadd115d34&createdTime=1616883610266&parentMessageId=1616883610266",
  "policyViolation": null,
  "from": null,
  "body": {
    "contentType": "html",
    "content": "<systemEventMessage/>"
  },
  "channelIdentity": {
    "teamId": "fbe2bf47-16c8-47cf-b4a5-4b9b187c508b",
    "channelId": "19:4a95f7d8db4c4e7fae857bcebe0623e6@thread.tacv2"
  },
  "onBehalfOf": null,
  "attachments": [],
  "mentions": [],
  "reactions": [],
  "eventDetail": {
    "@odata.type": "#microsoft.graph.channelDescriptionUpdatedEventMessageDetail",
    "channelId": "19:cb9c31f1c4c446fa820a64e07cacacc9@thread.tacv2",
    "channelDescription": "Channel description updated",
    "initiator": {
      "application": null,
      "device": null,
      "user": {
        "id": "1fb8890f-423e-4154-8fbf-db6809bc8756",
        "displayName": null,
        "userIdentityType": "aadUser"
      }
    }
  }
}

Channel renamed

{
  "id": "1616883610266",
  "replyToId": null,
  "etag": "1616883610266",
  "messageType": "systemEventMessage",
  "createdDateTime": "2021-03-28T03:50:10.266Z",
  "lastModifiedDateTime": "2021-03-28T03:50:10.266Z",
  "lastEditedDateTime": null,
  "deletedDateTime": null,
  "subject": null,
  "summary": null,
  "chatId": null,
  "importance": "normal",
  "locale": "en-us",
  "webUrl": "https://teams.microsoft.com/l/message/19%3A4a95f7d8db4c4e7fae857bcebe0623e6%40thread.tacv2/1616883610266?groupId=fbe2bf47-16c8-47cf-b4a5-4b9b187c508b&tenantId=2432b57b-0abd-43db-aa7b-16eadd115d34&createdTime=1616883610266&parentMessageId=1616883610266",
  "policyViolation": null,
  "from": null,
  "body": {
    "contentType": "html",
    "content": "<systemEventMessage/>"
  },
  "channelIdentity": {
    "teamId": "fbe2bf47-16c8-47cf-b4a5-4b9b187c508b",
    "channelId": "19:4a95f7d8db4c4e7fae857bcebe0623e6@thread.tacv2"
  },
  "onBehalfOf": null,
  "attachments": [],
  "mentions": [],
  "reactions": [],
  "eventDetail": {
    "@odata.type": "#microsoft.graph.channelRenamedEventMessageDetail",
    "channelId": "19:cb9c31f1c4c446fa820a64e07cacacc9@thread.tacv2",
    "channelDisplayName": "Standard channel rename",
    "initiator": {
      "application": null,
      "device": null,
      "user": {
        "id": "06a5b888-ad96-455e-88ef-c059ec4e4cf0",
        "displayName": null,
        "userIdentityType": "aadUser"
      }
    }
  }
}

Channel set as favorite by default

{
  "id": "1616883610266",
  "replyToId": null,
  "etag": "1616883610266",
  "messageType": "systemEventMessage",
  "createdDateTime": "2021-03-28T03:50:10.266Z",
  "lastModifiedDateTime": "2021-03-28T03:50:10.266Z",
  "lastEditedDateTime": null,
  "deletedDateTime": null,
  "subject": null,
  "summary": null,
  "chatId": null,
  "importance": "normal",
  "locale": "en-us",
  "webUrl": "https://teams.microsoft.com/l/message/19%3A4a95f7d8db4c4e7fae857bcebe0623e6%40thread.tacv2/1616883610266?groupId=fbe2bf47-16c8-47cf-b4a5-4b9b187c508b&tenantId=2432b57b-0abd-43db-aa7b-16eadd115d34&createdTime=1616883610266&parentMessageId=1616883610266",
  "policyViolation": null,
  "from": null,
  "body": {
    "contentType": "html",
    "content": "<systemEventMessage/>"
  },
  "channelIdentity": {
    "teamId": "fbe2bf47-16c8-47cf-b4a5-4b9b187c508b",
    "channelId": "19:4a95f7d8db4c4e7fae857bcebe0623e6@thread.tacv2"
  },
  "onBehalfOf": null,
  "attachments": [],
  "mentions": [],
  "reactions": [],
  "eventDetail": {
    "@odata.type": "#microsoft.graph.channelSetAsFavoriteByDefaultEventMessageDetail",
    "channelId": "19:cb9c31f1c4c446fa820a64e07cacacc9@thread.tacv2",
    "initiator": {
      "application": null,
      "device": null,
      "user": {
        "id": "1fb8890f-423e-4154-8fbf-db6809bc8756",
        "displayName": null,
        "userIdentityType": "aadUser"
      }
    }
  }
}

Channel unset as favorite by default

{
  "id": "1616883610266",
  "replyToId": null,
  "etag": "1616883610266",
  "messageType": "systemEventMessage",
  "createdDateTime": "2021-03-28T03:50:10.266Z",
  "lastModifiedDateTime": "2021-03-28T03:50:10.266Z",
  "lastEditedDateTime": null,
  "deletedDateTime": null,
  "subject": null,
  "summary": null,
  "chatId": null,
  "importance": "normal",
  "locale": "en-us",
  "webUrl": "https://teams.microsoft.com/l/message/19%3A4a95f7d8db4c4e7fae857bcebe0623e6%40thread.tacv2/1616883610266?groupId=fbe2bf47-16c8-47cf-b4a5-4b9b187c508b&tenantId=2432b57b-0abd-43db-aa7b-16eadd115d34&createdTime=1616883610266&parentMessageId=1616883610266",
  "policyViolation": null,
  "from": null,
  "body": {
    "contentType": "html",
    "content": "<systemEventMessage/>"
  },
  "channelIdentity": {
    "teamId": "fbe2bf47-16c8-47cf-b4a5-4b9b187c508b",
    "channelId": "19:4a95f7d8db4c4e7fae857bcebe0623e6@thread.tacv2"
  },
  "onBehalfOf": null,
  "attachments": [],
  "mentions": [],
  "reactions": [],
  "eventDetail": {
    "@odata.type": "#microsoft.graph.channelUnsetAsFavoriteByDefaultEventMessageDetail",
    "channelId": "19:cb9c31f1c4c446fa820a64e07cacacc9@thread.tacv2",
    "initiator": {
      "application": null,
      "device": null,
      "user": {
        "id": "1fb8890f-423e-4154-8fbf-db6809bc8756",
        "displayName": null,
        "userIdentityType": "aadUser"
      }
    }
  }
}

Chat renamed

{
  "id": "1615943825123",
  "replyToId": null,
  "etag": "1615943825123",
  "messageType": "systemEventMessage",
  "createdDateTime": "2021-03-1706:47:05.123Z",
  "lastModifiedDateTime": "2021-03-1706:47:05.123Z",
  "lastEditedDateTime": null,
  "deletedDateTime": null,
  "subject": null,
  "summary": null,
  "chatId": "19:2da4c29f6d7041eca70b638b43d45437@thread.v2",
  "importance": "normal",
  "locale": "en-us",
  "webUrl": null,
  "channelIdentity": null,
  "onBehalfOf": null,
  "policyViolation": null,
  "from": null,
  "body": {
    "contentType": "html",
    "content": "<systemEventMessage/>"
  },
  "attachments": [],
  "mentions": [],
  "reactions": [],
  "eventDetail": {
    "@odata.type": "#microsoft.graph.chatRenamedEventMessageDetail",
    "chatId": "19:2da4c29f6d7041eca70b638b43d45437@thread.v2",
    "chatDisplayName": "Microsoft Teams Members",
    "initiator": {
      "application": null,
      "device": null,
      "user": {
        "id": "1fb8890f-423e-4154-8fbf-db6809bc8756",
        "displayName": null,
        "userIdentityType": "aadUser"
      }
    }
  }
}

Conversation member role updated

{
  "id": "1616883610266",
  "replyToId": null,
  "etag": "1616883610266",
  "messageType": "systemEventMessage",
  "createdDateTime": "2021-03-28T03:50:10.266Z",
  "lastModifiedDateTime": "2021-03-28T03:50:10.266Z",
  "lastEditedDateTime": null,
  "deletedDateTime": null,
  "subject": null,
  "summary": null,
  "chatId": null,
  "importance": "normal",
  "locale": "en-us",
  "webUrl": "https://teams.microsoft.com/l/message/19%3A4a95f7d8db4c4e7fae857bcebe0623e6%40thread.tacv2/1616883610266?groupId=fbe2bf47-16c8-47cf-b4a5-4b9b187c508b&tenantId=2432b57b-0abd-43db-aa7b-16eadd115d34&createdTime=1616883610266&parentMessageId=1616883610266",
  "policyViolation": null,
  "from": null,
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Meeting policy updated

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Members added

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Members deleted

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Members joined

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Members left

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Tab updated

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Team archived

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Team created

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Team description updated

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Team joining disabled

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Team joining enabled

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Team renamed

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Teams app installed

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  "importance": "normal",
  "locale": "en-us",
  "webUrl": "https://teams.microsoft.com/l/message/19%3Ad0891bf6638f48e8be186e2e92b4a554%40thread.tacv2/1620046494994?groupId=97a5ecc4-300b-4c5a-9f87-ca9a4969b3e0&tenantId=df81db53-c7e2-418a-8803-0e68d4b88607&createdTime=1620046494994&parentMessageId=1620046494994",
  "from": null,
  "policyViolation": null,
  "body": {
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  "channelIdentity": {
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  "eventDetail": {
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    "teamsAppId": "aa5fe6c5-f91c-45ed-88de-640e235ad21b",
    "teamsAppDisplayName": "Flipgrid",
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Teams app removed

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Teams app upgraded

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Team unarchived

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    "@odata.type": "#microsoft.graph.teamUnarchivedEventMessageDetail",
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