Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
7,137 questions
Authentication Fails with Error code 500121
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(195.2, 68%, 28%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAH%3C/text%3E%3C/svg%3E)
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.
Regards,
Azhar Hussain
Sign in to answer