Moving to full Intune - Devices still showing as "Co-managed"

Question

We setup SCCM for co-management last year, however, as we only really use SSCM for app deployment we have decided to remove SCCM and go completely with InTune. Our existing Windows 10 clients are enrolled into Intune but have a status of:

managed by = co-managed
compliance = see configmgr

New Windows 10 devices (not registered with SCCM) can enrol into Intune and have a status of:

managed by = intune
compliance = compliant

We have deleted the 'co-management' config within SCCM. We have also uninstalled the CM agent (ie: ccmsetup.exe /uninstall) on a handful of existing Windows 10 client, however, these still show as 'co-managed' and have a compliance status of 'see configmgr'.

How can we get the existing Windows 10 client to update so Intune knows its fully authoritative? At the moment we can only deploy Intune apps to the new Window 10 clients.

Answer 1

Still got the same problem. Summary of steps taken.

-Deleted/removed all cloud services/links from SCCM
-Retire win10 device from InTune
-Deleted win10 device from AAD
-Ensured ConfigMgr agent is uninstalled from device
-Reboot device
-Reregister device back to AAD (hybrid joined)
-Allow device to auto enrol back into Intune

Device still has a MDM status of: System Center Configuration Manager

I'm at a loss now.

Answer 2

unfortunately deleting the certificates hasnt resolved the issue for us.

Answer 3

update in case anyone else runs into this issue.... deleting the following reg keys fixed the issue:

\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DeviceManageabilityCSP
\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\CCMSetup