Hello Sergio A,
Please check with any of the Global admins in your tenant to revoke your current MFA sessions and again re-register for MFA for your user account by following the below steps:
To manage user settings, please complete the following steps:
1.Sign in to the Microsoft Entra admin center as at least an Authentication Administrator.
2.Browse to Identity > Users > All users.
3.Choose the user you wish to perform an action on and select Authentication methods. At the top of the window, then choose "Revoke multifactor authentication sessions" and then select “Require re-register multifactor authentication” option for the affected user.
Please refer to the below Screenshot for your reference.
Please login to portal.azure.com and complete the MFA registration process.
If there are no other Global admins in your tenant, please provide me the below requested details so that I can proceed with engaging Data Protection team.
As this information contains Personally Identifiable Information (PII), please share the following details via private message:
Contact phone number (add +Country code)
Contact email address
Global admin email address (affected account)
Country
TimeZone
Please send me the above requested details via private message so that I can proceed with the creation of support ticket with Data Protection team to resolve your issue.
Please let me know if you have any questions.