A Microsoft Authenticator flaw is bricking accounts - here's how to fix it
Briefly

The issue with Microsoft Authenticator occurs when adding a new account by scanning a QR code, overwriting accounts with the same username, causing chaos for users and helpdesks.
Users have complained about this problem since 2020, with it persisting since the authenticator's 2016 release, highlighting an ongoing issue for Microsoft.
Read at ITPro
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