Question about Ubiquiti UniFi Dream Machine Pro

Port forwarding - I am in despair. Dear Community, I bought the Dream Machine Pro to retire my old USG. I am connected to UPC, the UPC modem is in bridge mode. I define a port forwarding for my Emby server, the PC has port 8096 open in the firewall. However, the port is not forwarded, canyouseeme says port closed. I'm not a DAU, but I'm biting my teeth. YT doesn't help either, new interface. I made a plausible forwarding in the firewall rules with the port group and assigned it to my internal IP address. I can do whatever I want, it does not reach the target computer. Do you have any tips for me? It sounds trivial, but I'm getting nowhere. Ubiquiti is not responding either, since more than a week. Best regards, Lati