In MCS we have a Group Level Profile which we are unable to change.

When trying to change the NT Perfromance Metrics in MCS for a Group Profile the Save button is greyed out.

The Reference Device field had not been filled in.

When you create group configuration profiles with profile types that require data from a probe then you must select a reference device.

MCS gathers data for the profile type from the probes running on a reference device.