I'm having issues trying to claim my past season rewards. I tired different browsers, phone app, and my husband's computer. No matter what I do I get pop up that says "Play Destiny 2 to unlock", but I've been playing Destiny 2 since 2017?? Hopefully this screenshot helps.
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Try a different browser, there is meant to be an platform selector + character selector on that page just above the track. you possibly have an extension blocking it from appearing.