A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Dear User,
Good day!!
Apologies for the inconvenience caused and please don’t worry, let’s work together on your concern and move towards a resolution path.
I understand your concern and would like to let you know that if the multi-factor authentication is enabled by the organization where you are the Guest user, you need to contact the IT admin of the Office 365 organization for resetting the MFA on your Guest account. Reference: Manage authentication methods for Azure AD Multi-Factor Authentication - Microsoft Entra | Microsoft Learn
If you need any further help on the Microsoft Authenticator app, I suggest you to post your concern in the Questions - Microsoft Q&A with Microsoft Authenticator tag (as shown below) to get the detailed help from the experts.
Apologies for redirecting you to a different community as the members in the category posted focus on the users with the out-of-the box concerns and have limited knowledge on Microsoft Authenticator; so, to get the fast and better assistance, we have redirected you to the correct community.
Thanks for your patience and understanding. Have a good day!!
Best Regards,
Sophia