Last season I managed to win 12 games on diamond and therefore got all the trails up to and including the diamond trail. I could even use it right away! Now, since the Autumn patch I don't have any boost trails besides the standard. Were they removed from the game?
Apparently, the trails are causing some stability issues and were temporarily removed until the problem is fixed.
Due to stability issues on some platforms, we are disabling Season 4 Reward Trails until a fix can be deployed.
Thank you for your patience and understanding this weekend.