Cannot delete Viva Learning Provider even if all related Course-Activities and Learning-Contents are deleted

Question

We created a bunch of Learning Providers in our tenant for testing purposes.

We also created Learning Contents and assigned those contents to some users in our tenant by creating Course-Activities using Graph API

• POST /employeeExperience/learningProviders/{providerId}/learningCourseActivities

Now we would like to get rid of those providers but we are not able to delete them.

What we tried so far:

• We first deleted all Learning-Contents and all Course-Activities related to the providers.
• We even wrote a script to return all Course-Activities for all 3000 users of our tenant and deleted all entries which were related to our Learning-Providers. So there should definitely be no course-activities left anymore.
• We tried multiple times over an entire week to delete the providers, but we always get the same error message back:

    {
        "error": {
            "code": "forbidden",
            "message": "Request couldn't be processed. Delete all course activity records before deleting the provider.",
            "innerError": {
                "date": "2024-04-24T06:59:13",
                "request-id": "a47dadeb-b978-4d9c-aced-5d6e80190672",
                "client-request-id": "a47dadeb-b978-4d9c-aced-5d6e80190672"
            }
        }
    }
  

Additional Info:

• The DELETE request for the Provider is submitted using delegated permissions with our AD App which has the following API Permissions:
  

Questions:

• Are we missing something here or is this a bug ?
• Is there a way to query all course assignments of a Provider without having to query the assignments of every single user ?