Authentication Fails with Error code 500121

Azhar Hussain 5 Reputation points

Good day!

I have facing a problem to access my account, issue were started when i unregistered the previous account on my device and registered another new account on my authenticator App, now problem is that i can access the new Microsoft account, but can't access the previous account and i lost the integration information of the previous account, when going to sign-in the previous account then it's generating and sending the verification code for authentication but authenticator App not receiving it, now i can't access my previous account, how could i access my account while authentication failed?, i tried different ways to access the account but not succeed.

i need the keep both account at the same time.

Kindly help me to fix this problem.


Azhar Hussain

Microsoft Authenticator
Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
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