Forum Discussion

LarsKnoll's avatar
LarsKnoll
Copper Contributor
Jul 27, 2026

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. Del...
microsoft teams
MS Graph API
Sayali-MSFT's avatar
Sayali-MSFT
Icon for Microsoft rankMicrosoft
Jul 30, 2026

Hello LarsKnoll,
We are tried with the above scenario and it is working fine from our end.
I'd suggest verifying that the tab was created by the same Teams app/App ID used in the access token, confirming the token contains the expected TeamsTab.ReadWriteSelfForTeam scope, and comparing the teamsAppId returned by GET .../tabs?$expand=teamsApp with the app identity in the token.