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Microsoft 365 and Office | Subscription, account, billing | For business | Other
Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
SOLVED — Root cause: domain was partially registered in my own Azure Default Directory
The issue was NOT a previous owner's tenant. When I first attempted to add [Moderator note: Personally Identifiable Information removed] (domain) to M365, it got silently registered as unverified in my own Azure Default Directory — which then blocked M365 from accepting it.
Fix:
- Go to portal.azure.com → Microsoft Entra ID → scroll down in left menu → Custom domain names
- You will see [Moderator note: Personally Identifiable Information removed] (domain) listed with status Unverified
- Click on it → click Verify — it will succeed instantly if your TXT record is already live in DNS
- Go back to admin.microsoft.com → Settings → Domains → click the domain → Start setup
- Complete the wizard — ownership verification will pass and you can add all DNS records normally
No support ticket needed. The domain was blocked by my own tenant the whole time, not an external organization.
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