Hello Teams Community,
Please i need your help on this issue.
We are not able to chat with external domains and we are not able to change the setting in Coexistence mode from Islands to the team only as shown below:
This problem is addressed here with solution:
https://docs.microsoft.com/en-us/microsoftteams/troubleshoot/teams-administration/cannot-switch-to-teams-only-mode
To allow external contact you can check these settings:
https://docs.microsoft.com/en-us/microsoftteams/manage-external-access
If this was helpful, please Upvote and Accept Answer.Else, please Comment with further information or related questions.
Hi @66304432
What is your external user? Are they using Teams client?
Agree with kaaven! If you're an administrator, you can use the following diagnostic tool to validate a Teams user can communicate with a federated Teams user:
Select Run Tests below, which will populate the diagnostic in the Microsoft 365 Admin Center.
In the Run diagnostic pane, enter the Session Initiation Protocol (SIP) Address and the Federated tenant's domain name, and then select Run Tests.
The tests will return the best next steps to address any tenant or policy configurations that are preventing communication with the federated user.
It has been a while, how is everything going?
If you have any update about this issue, please feel free to post back.
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