I have listed the sign-in and token URL for Office 365 below. I discovered this while trying to configure our MDM with the ActiveSync profile for use with oauth. I initially attempted to populate the sign-in URL with our IDP (3rd party) link for O365 but this did not work. While I cannot speak to the Apple Configurator, our MDM used the Microsoft autodiscover if the links below were not populated. We were looking for the URL's below to avoid having the users type their email address, only to get redirected to our IDP where they would need to re-enter the username and password.
There may be a way to get the tenant URL but I could not find any documentation on how to obtain it. That said, if you use the URL's below, the login page on iOS will contain the user ID which they may click on and login. Hope this helps.
Sign-in - https://login.windows.net/common/oauth2/authorize
Token - https://login.windows.net/common/oauth2/token