Hello [rby],
Good day and thank you for posting in Microsoft community.
Based on your requirement, have checked, and seems at this moment there is no such report available on Microsoft365 admin center that can retrieve Users MFA’s method. We do understand your concern here, However, your concern is very meaningful, and we believe that this is many users concern as well, therefore we strongly recommend you to upload your concern as an idea to Microsoft Feedback site Ideas · Community (microsoft.com). We will also raise your concern to our Product Team and hopefully this can be included in the future updates.
Thank you for your precious time and understanding. For other concerns, please do not hesitate to add your post in the Microsoft Community Team.
Sincerely,
Ankita Vaidya | Microsoft Community Moderator