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Dear @Gimena, Jonathan R,
To better understand the situation, could you please confirm whether you are a standard user or a Global Administrator?
If you are a standard user, please contact the Global Administrator in your organization for assistance with resetting your MFA settings. They can follow these steps:
- Go to Microsoft Entra Admin Center: https://entra.microsoft.com
- Navigate to Users > All Users.
- Select the affected account.
- Go to Authentication Methods.
- Click "Revoke multifactor authentication sessions" and then select "Require re-register multifactor authentication".
Once this is completed, you should be able to sign in again and set up MFA on your phone.
If you are a Global Administrator, please first check whether there is another Global Administrator in your organization who can assist with resetting your MFA.
If you are the only administrator in the organization and are unable to access your account, you will need to contact the Microsoft Data Protection team for further assistance.
I hope the information above is helpful.
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