If you collected the bounty for the T-shirt, in game, after claiming 250 or more points of Moments in game, you can still generate
Your code in the MoT section of your Bungie.net profile.
If you did not claim the in game bounty, unfortunately Solstice is over, and there is no means of claiming further in game rewards (and therefore no means of obtaining a T-shirt code).
English
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Ahh okay I see... That kind of sucks, but it’s on me! Thanks for the answer!