Can't setup ARC (yet another one)

Roon Core Machine

Running Core on a QNAP NAS TVS-473 . The Core has been updated to 2.0

Networking Gear & Setup Details

The NAS is connect to the Huawei HG255 Gateway via ethernet. UpnP is enabled on the Huawei.
The error message I get is:
{
“connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},
“external_ip”: {“actual_external_ip”:“82.222.96.37”,“router_external_ip”:null},
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“server_ip”:“192.168.1.1”,“found_upnp”:true,“error”:“Did not find UPnP service with WANIPConnection on network”}
}

Connected Audio Devices

Number of Tracks in Library

Description of Issue