My twitch prime bundle still missing. According to help pages, I must post it here, so here I am...
Steps i've done so far:
Refresh twitch drop on bungie reward page (https://www.bungie.net/7/en/Codes/Partners).
I've tried to unlink my twitch account and re-link it and refresh the redeem button again.
Same issue here, this problem even occurred with the D.A.R.C.I exotic bundle. Under "Partner Rewards" it displays "Prime Gaming Reward Offer 30" August 8, 2022. I am assuming you at least see Prime Gaming Reward Offer 31" at some date which was for the D.A.R.C.I exotic bundle?