Hope this helps https://docs.omnissa.com/bundle/CredentialEscrowGateway/page/RequirementsandArchitecture.html
If it still doesn't help, choose "dislike" and provide feedback.
Have you tried using reporting feature? There is "count of Active Devices by Users"
Link: https://docs.omnissa.com/bundle/WorkspaceONE-UEM-Reports-AnalyticsVSaaS/page/NewReports.html