SonoBus doesn't connect for some reason (with a pfSense router)

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I wanted to stream audio from a headless Proxmox/LXC container going through a pfSense router to my phone in an entirely different network. I have asked the hoster to open all ports regarding SonoBus for both TCP and UDP, and even running an AoO server inside of the VPS itself. But after all of that work, I still get no connection, whereas if they connect to the same roon that I do, then I can see them as connected in the VPS, but not on my phone. Also for some weird reason, the "Check for New Version" button is completely moot.

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@essej I am sincerely sorry to disturb you but this issue has been there ever since I tried connecting to SonoBus and the NAT tests even say the NAT setting is permissive.