Hey Null7238, I think I remember this bug from a while back. Could you add the full string to the print-out for GameTagsString in that warning?
Like this:
UE_LOG_ONLINE(Warning, TEXT("Server setting %s overflows Steam SetGameTags call; current string: %s"), *NewKey, *GameTagsString);
That will help us figure out what is using all of the space. If I remember correctly though, it’s the IP/Port and the SteamP2P Address and Port that are taking up a majority of the 128 characters that fit in the GameTags.