Forum Discussion
Can’t sign in to admin account – MFA code not delivered to phone (Error Code: 399287)
Hello,
I’m unable to sign in to my Microsoft 365 admin account because the MFA verification code is not being delivered to my phone.
I don’t have any other administrator account in the tenant that could reset my MFA methods, so I’m currently locked out of administration completely.
Could you please advise how to restore access, or how to verify my identity so the MFA methods on this account can be reset? I’m happy to provide any information needed for verification.
Thank you for your help.
1 Reply
Because this is your only administrator and SMS verification is failing, resetting MFA from inside the tenant is currently unavailable to you. First check whether ‘Sign in another way’ offers an already registered Authenticator, security key or other working method. Also check phone reception and blocked-message settings; SMS delivery depends on telecom providers, so the error alone does not establish the cause. If no alternative works, contact Microsoft 365 business support using the current country-specific number in Microsoft’s global support directory and explain that all tenant administration is locked out. If every subscription was purchased through a partner, contact that partner for support instead. Have the tenant/account details, exact error and failed-attempt time ready, and ask what verification is required through the private support process. Do not publish identity documents or verification codes here. After access is restored, establish and regularly test independent emergency-access accounts.
