I am baffeled by the way this upgrade is communicated.
After about 8 browsertabs I still am just able to find partial information, with texts like "Select the checkbox next to the required permissions", but without mentioning the required permissions. Just share the one-stop-shop persmissionset to fully enable the functionalities within this module...
As far as comments in this thread go I believe I am not the only one.
However, if I understand correctly, we now end up with a module where each time the app id should be updated when you administer multiple Microsoft tenants, since you cannot choose the app id that will be created.
"With the theme of simplification" it might help to create a comprehensive setup-guide and an easy workaround to connect to multiple tenants.
For anyone lost in how to properly upgrade or create a new app registration:
https://github.com/microsoftgraph/powershell-intune-samples/blob/master/Updating%20App%20Registration
Tip 2: Do not use the wildcards in the return url. It's just urn:ietf:wg:oauth:2.0:oob
Hopefully this will be adressed, so that connecting to an environment becomes easier. Other modules are able to request a new registration if needed, while giving consent during authentication.