Hello Marius Hainal,
thank you for posting on the Microsoft Community Forums.
Based on the description, I understand that your issue is related to Microsoft Authenticator.
Since there are no engineers dedicated to Microsoft Authenticator in this forum. In order to be able to deal with your questions quickly and efficiently, I recommend that you repost your questions in the Q&A forum, where there will be a dedicated engineer to provide you with a professional and effective response.
Here is a link to the Q&A forum: https://learn.microsoft.com/en-us/answers/questions/
Have a nice day.
Best regards,
Lei