Login AES and verify below setting:
Communication Manager Interface -> Switch Connections, make sure H.323 Gatekeeper added
Networking -> Ports -> DMCC Server Ports, make sure Encrypted Port 4722 enabled
Go to Security -> HostAA -> Service settings -> Authenticate Client Cert with Trusted Certs, Uncheck DMCC, Click Apply changes.
After changing above, Restart ACR services.
In another case AES was on 6.3.3 SP3.We had them upgrade to AES 6.3.3 SP5. This has a number of WebLM fixes.They Implemented reserved licensing and restarted NICE services