The property 'attendees' does not exist on type 'Microsoft.OutlookServices.Event' while create event in hybrid deployment

Question

Give 400 error for post event in hybrid deployment of exchange for local mailboxes. For cloud mailboxes works all correst, so java code is correct.

Error message: The property 'attendees' does not exist on type 'Microsoft.OutlookServices.Event'. Make sure to only use property names that are defined by the type or mark the type as open type. REST APIs for this mailbox are currently in preview. You can find more information about the preview REST APIs at https://dev.outlook.com/.
POST https://graph.microsoft.com/v1.0/me/events
SdkVersion : graph-java/v3.2.0
SdkVersion : graph-java/v3.2.0
[...]
400 : Bad Request

Use microsoft-graph 3.4.0

All of requirements in https://learn.microsoft.com/en-us/graph/hybrid-rest-support#requirements-for-the-rest-api-to-work-in-hybrid-deployments are met

get calendar works correct to for all types of mailboxes (local and cloud)

Authorization Code Flow is used if it is important

Answer 1

Hi, any update on this issue? I am running into the exact same problem here.
Creating events for online mailboxes works fine out of my application.
Creating events for on-premise mailboxes works fine using the Graph Explorer
Creating events for on-premise mailboxes does not work out of my application

Answer 2

any updates? we are encountering the same issue but only for some users