Microsoft 365 admin center - Unable to login by verifying using SMS

Phill Hayman 205 Reputation points
2026-07-01T02:14:26.5533333+00:00

Good morning!

We're unable to log into our Microsoft 365 tenant's Admin Center because verifying using SMS is not working. The system claims the account is not verified but doesn't allow any other options (error Code 399287).

I found in a few other post this can be solved by the engineering team, so I'm tagging the person from Microsoft that was able to get this fixed: @Raja Pothuraju , could you do the same for me?

Kind regards,

Phill H

Microsoft Security | Microsoft Entra | Microsoft Entra ID
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  1. JimmySalian-2011 45,531 Reputation points Volunteer Moderator
    2026-07-01T04:41:02.7366667+00:00

    Hi Phill,

    Ideally you should have another account as a backup in case the primary account have issues, it is known as breakfix account. However in this instance if you are the only admin of the tenant the only way to recover is to call up global numbers and provide the ownership and identity proof of the tenant that you own it.

    https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2

    Hope this helps.

    JS

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