User unable to join client created Teams meetings on personal devices.

Question

I have a user who has been joining a different tenant's Teams call on personal devices and recently it is giving the error message, "Access is blocked by your organization. Your tenant administrator has restricted which organizations can be accessed." However we have not restricted the tenant in question and the user is still able to dial into these meetings/calls from the organization provided device. Not sure what is different on the personal devices.

Things tried:

-Signing out of Teams and signing back in

-Updating the applications on the devices in question

Answer 1

@Christopher Stewart

This error message indicates that the user is trying to join a Teams meeting from an unmanaged device, and the organization has blocked access to Teams for such devices. A possible cause is that the external access or guest access settings are not configured properly in either your organization or the other tenant’s organization. You can check the following setting in the Microsoft Teams admin center:

• User >Guess access > On.
• User > External access > Choose which external domains your users have access to > Allow all external domains.
• Users section > select the user who has the problem, and make sure that Block sign-in is not selected.

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