Hi @Tilman Schmidt
I understand that you are trying to register the Microsoft Authenticator app as an authentication method, but you're encountering sign-in error code 50192 when you click on "Security information."
To resolve this, first check if the user has Certificate-Based Authentication (CBA) enabled. To do this, Microsoft Entra admin center > Protection > Authentication methods > Policies and check whether CBA is indeed enabled for a specific, limited group in which you have your desired user.
If CBA is enabled, it may be causing the issue, as the system is prompting for CBA during the "Security information" sign-in process.
To fix the issue, try disabling the CBA authentication method for the user and also exclude the user from any Conditional Access policies that are being triggered, as indicated in the sign-in logs.
Hope this helps. Do let us know if you have any further queries.
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Thanks,
B. Siri Chandana.