All Azure AD tenants are named as sub-domains of the root onmicrosoft.com. For example yourcompany.onmicrosoft.com. Some very early adopters of eg. Office 365 might also have tenant names that look like this emea.microsoftonline.com, but AFAIK all new tenants will inherit the onmicrosoft.com domain. But names are fickle, so every Azure AD tenant also has a …
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