Personal Microsoft account associated with old Entra tenant — cannot access organization settings or leave

My personal Microsoft account works, including its current Microsoft Authenticator verification. However, it remains associated with an old organization, iiivvicom.onmicrosoft.com.

Accessing that tenant prompts for an Authenticator registration I no longer have. I have no old device, no available alternative verification method, and no known accessible administrator. I have not established whether my account has an administrator role in this tenant.

I have also tried the tenant-specific My Account link. When I navigate to Organizations, it asks me to sign in with an organizational account rather than allowing me to manage the association using my personal Microsoft account.

Microsoft’s support/Engage Center denies me access, so I have been unable to open a recovery case there.

Could a Microsoft moderator help me identify a supported written escalation route to recover access or remove this obsolete organization association? I can provide tenant identifiers and identity or ownership evidence privately through an official secure support channel.

Please preserve my personal Microsoft account, Outlook mailbox, working authentication methods, and unrelated directory associations.