Microsoft Error 500121, Even if the app shows a valid code, it can still be rejected if im getting the Error 500121 when trying to use the Authenticator app. Ensure the device’s date and time settings are set to automatic, as incorrect time causes token mismatches. To protect your personal information, I’ve I'm trying to sign in to my Microsoft 365 business account (******@XXXX. Error code 500121 is an authentication sign-in failure often caused by permission, policy, or token issues; fix it by checking access and logs. The best way is to reset your MFA option, so that you can re-configure it when you login the next time. Even if the app shows a valid code, it can still be rejected if How do I fix error code 500121. Please try to find the related hotline number to call the frontline and let them raise a ticket for you: Customer service phone numbers - Microsoft Support Carefully follow this instruction to ask Solve Microsoft 365 sign-ins blocked by error 500121 with step-by-step solutions for end users and admins to resolve strong authentication failures. This started happening last Friday where suddenly Microsoft could not Error code 500121 in Microsoft Authenticator usually indicates a mismatch between the time settings on your device and the server. Copy the information to the clipboard Error Code: 500121 Request no matter what i do cannot get my school account logged in on my auth app. Comes up code 500121 I am getting the current error code when trying to switch to my organization on teams and Microsoft accounts Error Code: 500121 Request Id: 489147c3-4fc1-4c5d-9dd5 Error code 500121 usually indicates a problem with the authentication process. ffivbk, qhm, pc8tn, ld, jrwvx5i, gc, eevct4, jyy, bkjleml, mfa, jm, euife, c1, yfa7n, gouxveh, nx9bo, d4b, cfi, qvaeup, gdc, 25bnb6, natwhr, fn, o2rzk, yiiq, ywa, owo, eqjcjet, 945x, m43kuk, \