Hi @Carlo_Patargo,
Thank you for your patience and please accept my apologies on behalf of the team that you’ve waited so long for an official response here.
There are several VPN workarounds and proxy server solutions that users have started to test out in the #tinkering and #roon sections. I suggest you take a look into this thread, for example. Note that VPNs aren’t officially supported by Roon, so the support team can’t help you out directly; however, many other users will be able to provide assistance.
That said, we’ll want to try everything possible to get port forwarding working with your current ISP tier and subscription. If you don’t mind, who is your ISP? It’s possible that their carrier-grade NAT isn’t implemented in a way that fully prohibits port forwarding, and there may be steps you can take independently to possibly allow for mobile ARC playback via manual port forwarding configuration.