After several days of frustrating efforts to get Roon Arc to work I found a solution that might be helpful to others experiencing these issues. I contacted my ISP and requested a static IP address to counter the CG-NAT issue. That did the trick. There is an incremental monthly cost, but one that is well worth it to be able to use Roon Arc. My Orbi WIFI router automatically used the static address from the cable modem. I deleted and re-installed Roon Arc on my phone. It was able to access the ROCK while on my home network. I then turned off WIFI on the phone and Roon Arc was still able to connect over the cellular network and I no longer received the message that Roon Arc was not configured to work outside my home network. Hope that helps others in the community.
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