Hello Joseph,
This looks like a MFA error code. You will want to reach out to your IT Administrators to have them Require you to re-register your Multi-Factor Authentication options.
If this is helpful please accept answer.
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Error Code: 500121
Request Id: f75b5cea-3163-498e-83d3-5d43e8c21900
Correlation Id: ea335f08-d768-4ddf-924e-4a225bd54afb
Timestamp: 2023-04-29T08:30:31Z
Hello Joseph,
This looks like a MFA error code. You will want to reach out to your IT Administrators to have them Require you to re-register your Multi-Factor Authentication options.
If this is helpful please accept answer.
Looks like you are getting error due to MFA.
Error Code: 500121
This typically occurs when authentication failed as part of the multi-factor authentication (MFA) request, it may indicate a configuration or service error. To resolve this issue, can you try resetting (require re-register) MFA for your user.
With this user will be asked to re-register for MFA. Once the registration is done for user, you can again try to login and it should be successful.
Note: You will have to use global admin account to login to Azure portal and select the option "require re-register MFA".
Let me know if you have any further questions on this.
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