Can't set up ARC

I have followed these links for troubleshooting:

When trying to connect to Roon ARC, I continually get errors. I’ve activated UPnP, tried with bridge mode active (have since disabled it), setup port forwarding on port 55000 (have since deleted this port forwarding) and assigned a static IP of 192.168.7.242 (which is what it pulled as DHCP) then rebooted the Core.

This is the error message I receive:
{

“connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},

“external_ip”: {“actual_external_ip”:“74.aaa.bbb.ccc”,“router_external_ip”:“192.168.1.88”},

“status”: “status”: MultipleNatFound

,

“natpmp_autoconfig”: {“status”:“NotFound”},

“upnp_autoconfig”: {“server_ip”:“192.168.7.1”,“found_upnp”:true}

}

My equipment is the Core plugged into an Arris W31 router/modem plugged into an Altice modem from the ISP (Optimum Internet).

Any assistance would be appreciated.

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