ntozier
Not necessarily, it depends on what they chose for Supported Account Types during the setup of the App Registration. If they chose "Accounts in this organizational directory only" (default) it will be their Tenant ID, if they chose "Accounts in any organizational directory" it will be organizations, if they chose "Accounts in any organizational directory and personal Microsoft accounts" it will be common, and if they chose "Personal Microsoft accounts" I don’t know what it will be as I’ve never tested that one.
The only way to know what the correct URLs to use are is by clicking Endpoints at the top of the Overview screen within the registered app.
Cheers.
