This article will explain the possible scenarios at which you can encounter this error and the steps you can take to resolve them.
Scenario(s):
- Setting up M365 licenses during user creation.
- Setting up M365 licenses during user modification.
Potential root causes: Licenses being assigned are conflicting with one another.
Troubleshooting methods:
- Check if the same combination of licenses can be set on the Microsoft 365 portal directly
- Verify with an alternate service account under Microsoft 365 configuration page of ADManager Plus (Admin tab --> Microsoft 365)