I'm guessing you own the game on Steam and not from EA/Origin? Are you using the base game or Northstar? If Northstar, did you have more trouble setting that up than on your Windows PC?
Northstar first got really popular in a period when the official Titanfall 2 servers were extremely unreliable - you'd either be stuck matchmaking forever even with a supposedly large number of players online, or you'd start a game with 12 players and be lucky to have 3 or 4 of them still connected by the end. Most people blamed the problems on DDoS attackers, and although the game developer Respawn acknowledged the problems, they never really delivered a server-side or client-side fix for them. So, the only enjoyable way to play TF|2 on PC was with Northstar.