Teams Federation isn't working

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 Teams Federation isn't working.


The Get-CsTenantFederationConfiguration will show the current settings of your federation setup.
Nevertheless, if you are owner of an Microsoft TRIAL tenant, federation with other tenants isn't working automatically any longer.

Microsoft had introduced an new parameter:
-ExternalAccessWithTrialTenants "Blocked" 

Therefore, all Microsoft Tenants have the new DEFUALT setting "Blocked" defined.
Your partner organization must remove "ALLOW" the federation with you.

This also impacts all Microsoft MVP Tenants with only MVP assigned licenses.


Note a side:
The RUN TEST diagnostic will provide you with false positives here:
https://aka.ms/TeamsFederationDiag

IT Admins - Manage external meetings and chat with people and organizations using Microsoft identities - Microsoft Teams | Microsoft Learn


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