Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello Miriam Tiemeier,
Good morning to you and thanks for your post in the Microsoft Community.
Based on your post, seems you stuck in Microsoft Authenticator app. For this, it is suggested to contact your Microsoft365 global admin and ask admin to reset Microsoft Authentication for your account from azure portal by follow the steps mention in Manage authentication methods for Microsoft Entra multifactor authentication - Microsoft Entra ID | Microsoft Learn and check.
Further for Microsoft Authenticator app as we have separate dedicated team who are handling Microsoft Authenticator app related queries only. So it is suggested to post your question on Microsoft Authenticator - Microsoft Q&A, so dedicate support engineer team can check and further assist you. At this point, your kind cooperation and understanding will be highly appreciated.
Thank you very much for your precious time.
Sincerely
Ankita Vaidya