[fweimer]

Doesn't the end point show up once you have SSO with your own identity provider enabled for any Microsoft services? Maybe technically this means that you have an Active Directory tenant as well, but it doesn't necessarily imply that you are using those Active Directory services for anything beyond that SSO capability.

For Google Workspace, a similar URL is: https://www.google.com/a/example.com/ServiceLogin

[hirsin]

Yes, it means that you have a tenant in AAD that's usable for signing into SaaS products and Office. May not have many or any users in it, but it exists.