Most of our SCCM clients enabled co-management just fine. Howerver, we have some that have not completed the enroll. We've checked and they are Hybrid AD, and the SCCM server is showing the SCCM agent doing policy requests. But when we try to do anything with Software Center there is no content. Searching the logs we find that agent is complaining about not finding a policy in the MDM.
Looking in the event log for the DeviceManagement-Enterprise-Diagnostics-Provider shows
Warning 12/29/2020 2:55:35 PM DeviceManagement-Enterprise-Diagnostics-Provider 78 None
Information 12/29/2020 2:55:35 PM DeviceManagement-Enterprise-Diagnostics-Provider 87 None
Information 12/29/2020 2:40:15 PM DeviceManagement-Enterprise-Diagnostics-Provider 75 None
Information 12/29/2020 2:40:15 PM DeviceManagement-Enterprise-Diagnostics-Provider 88 None
Warning 12/29/2020 2:40:15 PM DeviceManagement-Enterprise-Diagnostics-Provider 78 None
Information 12/29/2020 2:40:15 PM DeviceManagement-Enterprise-Diagnostics-Provider 87 None
Information 12/29/2020 2:40:10 PM DeviceManagement-Enterprise-Diagnostics-Provider 1708 None
Information 12/29/2020 2:40:10 PM DeviceManagement-Enterprise-Diagnostics-Provider 1700 None
Information 12/29/2020 2:17:10 PM DeviceManagement-Enterprise-Diagnostics-Provider 75 None
Information 12/29/2020 2:17:10 PM DeviceManagement-Enterprise-Diagnostics-Provider 88 None
Warning 12/29/2020 2:17:10 PM DeviceManagement-Enterprise-Diagnostics-Provider 78 None
Information 12/29/2020 2:17:10 PM DeviceManagement-Enterprise-Diagnostics-Provider 87 None
The warning event is "Auto MDM Enroll DMGetAadDeviceToken Failure (The user name or password is incorrect.)"
We tried reinstalling the SCCM Agent, but that did nothing. There don't appear to be any tools to try and fix a failed enrollment. There also isn't a whole lot of information on troubleshooting issues. The client I'm working with has put the entire co-management on hold until we can resolve the issues.

