Dear Makaila Quinata,
Thank you for posting your question in the Microsoft Q&A forum.
The error 500121 usually occurs when there is a failure in the MFA process as you have already experienced. In your case, the quickest solution would be reaching out to your IT or admin team and ask them to reset the MFA methods for you.
Below is a step-by-step solution tailored for your IT admin to follow to reset MFA for your account
- Sign in to the Entra Admin Center using the Global Administrator account
- Go to Identity > Users > All users
- Select the affected account > Authentication methods
- Reset MFA for the user (Manage authentication methods for Microsoft Entra multifactor authentication)
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Note: Resetting MFA will sign the user out of all sessions and require MFA to be set up again.
Please let me know if you need help explaining this process to your IT administrator or if you have any additional questions.
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