An organization wants to use the VMware Tunnel edge service of VMware Workspace ONE UAG...

 The most likely cause of this issue is that the VPN payload in a device profile is configured incorrectly in UEM. The VPN payload defines how devices connect to the VMware Tunnel edge service and access internal resources. If the VPN payload is incorrect, the devices will not be able to establish a VPN connection with the VMware Tunnel edge service and “Test Connection” with VMware Tunnel will fail. The organization should review and correct the VPN payload settings in UEM. The other options are not likely causes of this issue because:

The Device Traffic Rules are configured in UEM, not in Unified Access Gateway. They define which applications or domains are allowed or blocked by the VMware Tunnel edge service.

If the Device Traffic Rules are incorrect in UEM, they would affect all devices that connect to the VMware Tunnel edge service, not just “Test Connection” with VMware Tunnel.

If the Unified Access Gateway is unable to communicate with UEM, it would affect all edge services that require UEM integration, such as Content Gateway and Horizon, not just VMware Tunnel.