Hello,
I tried to register a Service Principal to a Sharepoint Site according to https://learn.microsoft.com/en-us/sharepoint/dev/solution-guidance/security-apponly-azureacs
Unfortunately, "Create" results in the following Error Message:
I have Sharepoint Admin and Site Admin Rights.
Can someone help me?
Best regards
This is the reason...
Have you run: Set-SPOtenant -DisableCustomAppAuthentication $false
With that being said, I strongly recommend that you move over to Azure-AD permission and Graph permissions instead!