Hi @Carey_Head,
We’d be happy to take it home from here. Three quick suggestions based on the most recent diagnostics:
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Verify UPnP is enabled and updated on the new Netgear modem.
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You’ll want to place the Netgear modem/router in bridge mode if your Core is connected to the Orbi WiFi network. Here’s a guide.
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Roon is currently attempting to use UPnP to connect to ARC, according to diagnostics, but it can also connect via manual port forwarding. Other users (like in this thread, for example) have had better luck with the latter method on Orbi router setups. If the above steps don’t help, then we’ll try setting a manual port forwarding rule in the web admin of both the Orbi and Netgear routers pointing to the static IP and port listed in Roon → Settings - ARC from your screenshot.
Hang in there! We should have ARC up and running soon.