This was limited time deal and ended back in January.
If you did indeed buy the expansion before that, it should be in the Special Orders vendor named Tess at the Tower.
She's right by the post master!
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Yes it is not there. The first pre order from game stop sparrow is there along with a few other items but the tumbler is missing and I can't find a way for bungie to look into my account and see why our fix it.