TeamsTab.ReadWriteSelfForTeam: deleting a tab fails with 400 "appId cannot be null or whitespace"
We have a published Teams app that pins a configurable tab into a team channel via Microsoft Graph and removes it again when the user uninstalls our app from that channel. Creating the tab works. Deleting it always fails with a 400 that looks like an unhandled null-argument exception inside the Graph Teams service rather than a permission problem. I reported this in October 2025 as https://github.com/MicrosoftDocs/msteams-docs/issues/13432, but that is a documentation repository and the issue has had no response, so I am reposting here, as we can still reproduce the issue. We're using a delegated token for the operation. The only tab-related scopes are `TeamsTab.Read.All` (read-only) and `TeamsTab.ReadWriteSelfForTeam`. According to the docs (https://learn.microsoft.com/en-us/graph/api/channel-delete-tabs), `TeamsTab.ReadWriteSelfForTeam` is the **least privileged** delegated permission for the delete, so the token should be ok. What works Creating the tab, with the same delegated user token: POST https://graph.microsoft.com/v1.0/teams/«teamId»/channels/«channelId»/tabs Content-Type: application/json { "displayName": "«AppName»", "email address removed for privacy reasons": "https://graph.microsoft.com/v1.0/appCatalogs/teamsApps/«teamsAppId»", "configuration": { "entityId": "«entityId»", "contentUrl": "https://«ourhost»/teams/tabs/channel/«entityId»", "websiteUrl": "https://«ourhost»/app/tickets?channel=«entityId»", "removeUrl": "https://«ourhost»/teams/remove-tab/«entityId»" } } → `201 Created`. The tab appears in the channel and renders correctly. Listing the tabs afterwards also works and returns our tab together with its `id`: GET https://graph.microsoft.com/v1.0/teams/«teamId»/channels/«channelId»/tabs?$expand=teamsApp Works as well and lists our tab. Might be served by the TeamsTab.Read.All permission. What fails DELETE https://graph.microsoft.com/v1.0/teams/«teamId»/channels/«channelId»/tabs/«tabId» → `400 Bad Request` { "error":{ "code":"BadRequest", "message":"appId cannot be null or whitespace. (Parameter 'appId')", "innerError":{ "date":"2026-07-27T13:45:31", "request-id":"f930c847-0b48-4a46-b17e-f0ee10ff8177", "client-request-id":"f930c847-0b48-4a46-b17e-f0ee10ff8177" } } } (leaving in the error details, maybe that helps diagnosing the issue) appID is not even part of the request, it's probably resolved against the TeamsTab.ReadWriteSelfForTeam permission on your side. Let me know if you need any more details.
unable to send notification to teams channel using graph api
We tried to send notification to teams channel using microsoft graph api via python we can able to send to message to the channel but the notification is not getting triggered in the activity tab we have refered below documentation. https://learn.microsoft.com/en-us/graph/api/team-sendactivitynotification?view=graph-rest-1.0&tabs=python Also we don't need device authentication and browser authentication please share approach to bypass those things. below is the error we are facing. raise exc msgraph.generated.models.o_data_errors.o_data_error.ODataError: APIError Code: 403 message: None error: MainError(additional_data={}, code='Forbidden', details=None, inner_error=InnerError(additional_dmsgraph.generated.models.o_data_errors.o_data_error.ODataError: APIError Code: 403 message: None error: MainError(additional_data={}, code='Forbidden', details=None, inner_error=InnerError(additional_d APIError Code: 403 message: None error: MainError(additional_data={}, code='Forbidden', details=None, inner_error=InnerError(additional_d Code: 403 message: None error: MainError(additional_data={}, code='Forbidden', details=None, inner_error=InnerError(additional_d message: None error: MainError(additional_data={}, code='Forbidden', details=None, inner_error=InnerError(additional_d error: MainError(additional_data={}, code='Forbidden', details=None, inner_error=InnerError(additional_data={}, client_request_id='________-___-____-____-____________', date=datetime.datetime(2026, 2, 3, 14, 37, 8), odata_type=None, request_id='________-___-____-____-____________'), message="Application with AAD App Id '________-___-____-____-____________' is not authorized to generate notifications about 'https://graph.microsoft.com/v1.0/teams/6a6079bc-feaf-4865-bc21-1201b310c25c' to the recipient. Ensure that the expected Teams app is installed in the target scope (user, team, or chat).", target=None). Please help us to resolve this issue.
Issue Tracking Customer Declining/Cancelling a Microsoft Bookings Appointment via Email Client
Hi everyone, I’m using the Microsoft Graph API to create bookingBusiness calendars and allow customers to book appointments. When an appointment is created, a confirmation email is sent to the customer, and I save it in my database. However, when a customer declines or cancels the appointment by responding to the "Yes", "Maybe", or "No" options in the email, I don’t receive any notifications of this change. I need a way to track this status change to update the appointment in my database. Is there a way to track when a customer declines or cancels an appointment? Thank you for your help!
Ms Graph API: Set "Busy - In a call" does not cause new calls to be rejected
Hi everybody, Although I set the Presence State to “Busy – InACall”, new incoming calls are not rejected. And yes, Busy on Busy (Busy Options) is activated. So if I have a real Teams call a new incoming call is rejected. Any idea why setting “Busy – InACall” via Graph API does not cause new calls to be rejected? Regards Gerd
How resolve 'Remote server returned '550 5.7.708 Service unavailable.' error while send an email
I am able to send mail through Graph API but it is not received by the recipient. I have added O365 licenses and given all the permissions to the application which was created in the Azure portal. An access token is generated differently for the @outlook.com domain and onmicrosoft.com. Please help!
