Can i get the previous Season pass ticket ?
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If you go to the mission pass and hit "previous season", you can pick up rewards from that pass if you haven't picked them up yet. You can also apply a Gold pass to it to unlock those tiers if you hadn't already.
You can't gain progress for it from Tier Missions anymore though. It's possible you can still buy tiers with SG if you wanted to, but I haven't tried.