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Hi @Michael Krones,
Welcome to the Microsoft Q&A forum.
I would like to provide you with the following information:
It is possible that your account has been configured by the IT department with a policy that does not allow signing in or accessing the account from another device.
In this case, please contact your IT department to check whether any policies are currently applied that may be preventing you from signing in on a different device.
Additionally, if any error codes or error messages are displayed, please share that information with me.
Based on the details you provide, I will assist you and offer the most appropriate and effective solution.
I look forward to hearing from you.