how to find if im using a subdomain

Question

is there way of finding out what subdomains im using for Microsoft? I think I have set up several accounts for trails etc but when finalising it states The subdomain already exist. Or has been deleted recently and is still being cleaned up on the servers. The subdomain contains invalid characters.

Answer 1

Hi Chris,

The methods below will be useful for you to resolve an issue with the subdomain.

Microsoft 365 Admin Center

If you have administrative privileges, access the Microsoft 365 Admin Center.

Go to Settings > Domains to view all domains and subdomains linked to your account.

Microsoft Entra Admin Center

If you have configured subdomains in Azure AD, log into the Azure Portal.

Navigate to Microsoft Entra ID (AAD) > Custom domain names to review the registered domains.

Check DNS Records

If you think a subdomain may exist, utilize a DNS lookup tool (such as nslookup or dig) to verify if it resolves.

Microsoft Entra ID (formerly Azure AD)

If your subdomains are associated with Microsoft Entra ID, check the Custom Domains section in the Entra portal.

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