Roll back error during SfB user migration to Teams

In my latest project, I had the challenge to migrate an entire organization with 4.000 users from Skype for Business OnPrem to Micrsoft Teams in just two weeks. The customer planned to replace their current GoTo Meeting solution with Microsoft Teams. Of course, challenge accepted. During the migration I had to move the users from OnPrem to Skype for Business Online aka Teams. The migration to the cloud failed for some users with the message “An unknown error occurred while trying to roll back the user.” It took some time to resolve this error and this blog post is about it.

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