It is likely that the CDS was added to the Enforce whilst the VML profile was in training mode.
Resolution
Under current design it is not possible to have a VML policy replicate to a newly added CDS even if the VML has a prior version of the profile that is active on the on-prem servers
A documentation bug has been raised to alert customers of this in the Adding a Detection Server section.
Feature requests have been raised to allow a VML profile to be cancelled if it is in training mode.
Currently the only workaround is to completed the training for the VML profile