SharePoint connected system with Appian native

We are trying to create a SharePoint connected system with Appian native, but we are having problems with the authentication by "Client credentials".

The problem we have is that it can be done from Postman, but the parameter it asks for is "resource". And here we have no way (or I don't know it) to see the call to see why the call doesn't work.
Is there anyone who has been able to do it and can help me?

We already connect to SharePoint with Microsoft's API Graph, but we have to modify some metadata and it can't be done by API Graph, we are exploring this possibility.

Thank you very much.