Thin Client Registration Fails - WMS 1.4

Running WMS v 1.4.0.42077

Thin client is a Wyse 5070 Windows 10 IOT

Getting error in log "Domain is unknown DNS discovery cannot be performed."

TC has the DNS domain in the DNS suffix and the DNS server is defined in the IPv4 settings.

I can ping the WMS server by name

All SRV and TXT records were created in DNS

_WMS_GROUPTOKEN.xxx.com = defa-TokenName

_WMS_CAValidation.xxx.com =False

_WMS_MGMT Port 443 Weight 100 Created in _tcp

_WMS_MQTT Port 1883 Weight 100 Created in _tcp

Any idea what I'm missing here?

I can register a TC manually without issue.

Thanks for any feedback/suggestions