“Somehow, the school ‘adopted’ my personal Microsoft account, and now I can’t do anything in Azure with it.”
Geerling’s personal account dates back to a 2006 Xbox LIVE login and was never joined to any domain. A school’s Office 365 tenant claimed it anyway, with no email and no consent. Clicking ‘Leave’ left him flagged “RESTRICTED TENANT” and locked out of myapps.microsoft.com. Microsoft built an identity system where a stranger’s IT department can own your account.