Teamwork.Migrate.All app permission on private chat messages

[jeanfdeschenes]

Steps to reproduce

Send chat using POST /chats/{chat-id}/messages in app permissions with Teamwork.Migrate.All following : https://learn.microsoft.com/en-us/microsoftteams/platform/graph-api/import-messages/import-external-messages-to-teams

My payload (created date in the past) :

{
	"body": {
		"content": "test123",
		"contentType": "text"
	},
	"createdDateTime": "2025-12-08T21:42:31.7049935+00:00",
	"from": {
		"@odata.type": "#microsoft.graph.chatMessageFromIdentitySet",
		"user": {
			"id": "87f6e2ff-da35-4e36-9dab-f50d8e1a73a6",
			"@odata.type": "#microsoft.graph.teamworkUserIdentity",
			"userIdentityType": "aadUser"
		}
	}
}

Expected behavior

Looking at teams channel messages with the Teamwork.Migrate.All, I'm assuming I was able to import into chats as well seeing that same permission on the send chat message. Anything I try whether I try to create a chat in import mode or use a normal chat, I can never do it. The article about importing external messages into teams does not mention private chats, but the doc mentions the Teamwork.Migrate.All app permission so how do I send messages in app permissions to a chat?

Actual behavior

Bad gateway error when try to send a message using Teamwork.Migrate.All permission :

{
"error": {
"code": "BadGateway",
"message": "Failed to execute backend request.",
"innerError": {
"code": "1",
"date": "2025-12-09T21:42:31",
"request-id": "ab225512-77a3-4a27-861a-e3d071339bf2",
"client-request-id": "4b0b55e2-7708-4ef8-ba50-6b63bdcd8d2a"
}
}
}

And when trying to create the chat in migration mode :

{
	"error": {
		"code": "BadRequest",
		"message": "OperationFailed",
		"innerError": {
			"code": "1",
			"message": "Threadtype [chat] is not allowed to be imported",
			"date": "2025-12-09T21:38:33",
			"request-id": "34381509-3db5-47a9-92c6-880bd0283dd1",
			"client-request-id": "35006125-171e-4b9e-b730-affef15e5473"
		}
	}
}

Error details

Im not sure if I am doing something wrong or chats do not really support migration mode, in that case, we should remove the Teamwork.Migration.All permission from the doc.

Update :
If I remove the from property I even get an error mentioning the external messages import article which seems to indicate it is possible :

{
	"error": {
		"code": "Unauthorized",
		"message": "Message POST is allowed in application-only context only for import purposes. Refer to https://docs.microsoft.com/microsoftteams/platform/graph-api/import-messages/import-external-messages-to-teams for more details.",
		"innerError": {
			"date": "2025-12-09T21:56:35",
			"request-id": "ae2da542-f89f-402a-bca8-d6df3b1f707a",
			"client-request-id": "4b0b55e2-7708-4ef8-ba50-6b63bdcd8d2a"
		}
	}
}

[m365-agent-toolkit-assistant]

👋 Hi @jeanfdeschenes,

Thank you for reporting this issue! We want to let you know that:

⏱️ Our team will personally review your issue
🎯 You can expect a response within 1 business day

✨ This is an AI-generated initial response
🤖 AI-Generated Preliminary Analysis:

Based on multiple reported issues and Microsoft documentation:

• Teamwork.Migrate.All app permission and the Graph API only support importing messages in migration mode for Teams channels, not private chats.
• The error "Threadtype [chat] is not allowed to be imported" confirms migration import is explicitly unsupported for chats.
• The documentation's mention of Teamwork.Migrate.All can be misleading; this permission is for Teams/channel migration—not chats.
• There’s no workaround to import messages into chats using migration mode or app-only permissions. Attempts consistently fail with BadRequest or Forbidden errors.

Actionable Steps:

• If your scenario requires importing chat messages, you must open a feature request or product feedback to Microsoft.
• For importing historical messages, only Teams channels (not chats) are currently supported: Importing messages documentation.

Sorry for the confusion in documentation—this limitation is known. For more, refer to this GitHub issue discussion.

✨We'd love your feedback! Please take a moment to fill out our survey.

---

Note: This is an automated first response generated by AI. A human team member will review your issue and provide a more detailed response soon. We appreciate your patience!

[microsoft-github-policy-service]

Hi @jeanfdeschenes! We will investigate and if we require further information we will reach out to you. Please use this link to escalate if you don't get replies in two working days.

Best regards, Teams Platform

[Nivedipa-MSFT]

@jeanfdeschenes - Thanks for bringing this issue to our attention. We will check this and update you soon.

[jeanfdeschenes]

@Nivedipa-MSFT I was able to create a single chat in migration mode. In that chat I am able to post messages as another user using application permissions. I was never able to recreate another chat like that using the exact same payload. I had some colleagues test this as well and they were not able as well.

I'm wondering if there is or not an actual import mode for private chats, this is really not clear in the documentation apart from the Teamwork.Migration.All permission on the send chat message endpoint.