Roon Arc unable to access Roon core error

Roon Core Machine

Roon Core Machine: Mac mini A1347(October 2012) 2.3 GHz Quad-core i7

Networking Gear & Setup Details

Modem : ISP issued modem Huawei - Echolife HG84245H
Router : Unifi USG 3p
Switch : Unifi 16 port POE
Wi-Fi. : Unifi AP

Connected Audio Devices

Number of Tracks in Library

Description of Issue

Unable to configure the Roon Arc and getting the following error message;

“connectivity”: {“status”:“NetworkTimeout”,“status_code”:998,“error”:“”},
“external_ip”: {“actual_external_ip”:“”,“router_external_ip”:“”},
“status”: “status”: MultipleNatFound
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“server_ip”:“”,“found_upnp”:true}

Getting the same error.

Have confirmed UPNP is ON (Orbi). ROCK IP shows up OK on UPNP portmap table.