Thanks for project. As I suspected, both ping and player count showed correctly on my machine, as well as testing on multiple machines. I can guess that there’s a port or firewall issue on one or both machines you’re testing on. I’ll look into possible solutions to test for that tomorrow, but in meantime I’d recommend testing on machines on a different network than one you’re currently on, where more ports might be open.
Just to verify: you’re running Steam client on all machines while you’re testing this, correct? And you’re doing a Shipping Windows 64 package?