About the P2020 battle pass skin

I leveled up the battle pass to max, but I didn’t get the P2020 Evolution skin (the skin for maxing the pass). After reaching max level that season, I didn’t log into the game again, so I didn’t receive it. This might have been a bug at the time: after reaching max level, you could see the item as obtained but it didn’t actually go into your inventory, and you needed to log in again to claim it. What can I do to get it QAQ