Hello Yulia_,
Good day. Thank you for posting in the community!
I apologize for any inconvenience caused by Microsoft Authenticator. We mainly focus on the basics of Outlook and would like to provide guidance on your query.
For questions specifically related to multi-factor authentication, I recommend posting your concerns in the appropriate community. You can find expert support in the "Microsoft Authenticator" section in Microsoft Authenticator - Microsoft Q&A. Experts in this category have extensive knowledge of multi-factor authentication and can provide customized solutions to unique problems.
You can also check MS Authenticator related FAQ Common questions about the Microsoft Authenticator app - Microsoft Support
I apologize for redirecting you to a different community, but I believe this step will ensure faster and more accurate assistance for your specific scenario.
Thank you for your cooperation and understanding.
Feel free to post your questions in the Microsoft Community and we will always do our best to help you.
Sincerely,
Md Ashabul Haque | Microsoft Community Moderator