UPDATE: When player 2 logs in as player 1 by themselves, they are able to claim the reward. Then logging back out, and both players logging in together (so the aforementioned becomes player 2 again), seems to have worked. I’ll update further if this hasn’t solved the issue.
Playing on Xbox series x, and have purchased the premium battle pass. I always play local co-op, and my player 2 also purchased the premium battle pass. I can claim my unlocked rewards no problem, but when player 2 tries, it just keeps coming up with the “premium battle pass unlocked” message, then shows the battle pass, with rewards ready to be claimed…but they can’t actually select the rewards. Player 2 battle pass in co-op is bugged. Sigh.