Personal Microsoft account locked out of Azure portal by mandatory MFA — portal requires 6-digit code, Authenticator issues 8-digit code

Good day support,

I cannot sign in to the Azure portal with my personal Microsoft account (an MSA, not a work or school account). The subscription is my own pay-as-you-go subscription and I am the only administrator.

Password authentication succeeds. The Authenticator push approval with number matching also succeeds. After that, the browser still asks me to enter a verification code, but the input field accepts only 6 digits, while Microsoft Authenticator issues an 8-digit code for a personal account. Sign-in therefore fails with error 500121.

I have already: re-registered Microsoft Authenticator for the account, added a separate TOTP registration via "set up a different Authenticator app" (which produces 6-digit codes — also rejected), added email and SMS verification, and saved a recovery code. Signing in at login.live.com works normally; only the Azure portal fails. https://aka.ms/mfasetup and https://mysignins.microsoft.com/security-info both reject the account with "You can't sign in here with a personal account."

Error Code: 500121

Request Id: 3e31403a-ee91-45fd-bd97-2f403d935a00

Correlation Id: 01a08a23-0146-7d68-949f-50cf8eb2eac2

Timestamp: 2026-09-10T07:06:07Z

When I now open:https://portal.azure.com/#home

{

"sessionId": "ee02ddf269be45008e93405214b4ebf9",

"errors": [

{

  "errorMessage": "interaction_required: AADSTS16000: User account '{EUII Hidden}' from identity provider 'live.com' does not exist in tenant 'Microsoft Services' and cannot access the application 'c44b4083-3bb0-49c1-b47d-974e53cbdf3c'(Azure Portal) in that tenant. The account needs to be added as an external user in the tenant first. Sign out and sign in again with a different Azure Active Directory user account. Trace ID: 64a0220a-75e6-4828-8c58-a98f25516200 Correlation ID: 01633af5-e054-42ee-b3f6-fc61b0a35b2d Timestamp: 2026-09-10 08:36:04Z",

  "clientId": "c44b4083-3bb0-49c1-b47d-974e53cbdf3c",

  "scopes": [

    "https://jarvisapi.account.microsoft.com/.default"

  ]

}

]

}

Could this be escalated to the Data Protection / Tenant Recovery team to reset the MFA configuration on my account? I cannot open an Azure support request because that requires portal access.