Remember that AppID 480 is related to Spacewars
so, your Find Session will search for ALL hosted Games under that ID. This results in a few thousand results, and your Finf Session can’t find the ones inside that mass, that is related to your Project.
So a Tipp:
Use Advanced Session.
When hosting, add your Gamename as Servername via Property String.
And in FindSession, look specifically for that Property, to filter your Game out of Spacewar.
And remember to raise the Max results to a higher value (around 1000… or more of needed)
Properties can be used as additional Filters, too. Perhaps, when you want to look for a specific Map only, or a specific Player.