Please create a native folder for this season under By Network > TNT > Snowpiercer
It's up to TNT to make it available. Even on HBO Max, only season 1 is available. S2 is available on the TNT app on my phone and Roku.
Each episode of season 2 has been available since the day after it aired - but only via Search. TNT has done their part. The VOD Team has not created a Season 2 folder so the episodes are not accessible through the On Demand menu.
Please create the missing folders: