error 399287 when trying to login to my Microsoft account

Cobus van der Vyver 0 Reputation points
2025-10-27T13:54:13.6566667+00:00

Good day, We have a client who's Global Administrator MFA Phone number has been block. Meaning we cannot access the account.

We get the following error when trying to sign in and verify with the phone number

Error Code: 399287

Request Id: c5d84723-b904-4d79-9091-7d7915777200

Correlation Id: 49c85179-d8b4-4d86-9427-1965c91145c9

Timestamp: 2025-10-27T13:30:56Z

Unfortunately we do not have any other options available

Microsoft Security | Microsoft Authenticator
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