we want to enable Teams Public Preview Mode by configuring the Teams Update Policy for a few users. During our first test we have noticed that users can no longer login to MS Teams in Public Preview-Mode. If they disable Public Preview-Mode they can immediately sign-in again.
In Azure AD Sign-In logs we see that the sign-in is blocked by conditional access.
Access policy does not allow token issuance teams
Sign in error code 53003
Anybody experienced similar problems and know a workaround? I suuspect that Teams is using an unkown App-iD in Public Preview-Mode or something like that.