Intune clients co-managed with SCCM, show client check result as Failed and remediation as Fail.

Hi we have Intune clients co-managed with SCCM, the clients show active in SCCM correctly, however upon checking they show client check result as Failed and remediation as Fail.

What is the client check against? We are using a 3rd party AV product and so have changed the client settings to exclude the Endpoint protection. Majority of these clients are showing as client check failed yet they seem to be picking up policies and checking into SCCM just fine.