When trying to register an OAM IDP with Portal for ArcGIS 10.7 through a metadata.xml file, I get the following error: "Unable to register identity provider. Unable to register idp 'test' for account '0123456789ABCDEF', 'Invalid user license type.'. "
Nothing to see in the Portal logs.
There's nothing wrong with the metadata.xml file, because importing the same file in Portal 10.6.1 works fine.
I also tried to use an URL to provide the metadata of the IDP but I get the same error.