I just checked other posts, and asked my bud going through the same issue.
Im no bungie dev, so i could be wrong, but it appears that filling up on engrams, before grabbing drifters new quest, causes the bug.
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Im thinking its a weird conflict with the quest if so. The quest is kinda treating this like a intro/unlocking system, so the fact it appears to be conflicting with drifters free engram, before preliminary steps are completed, causes the lockout. Its unfortunate if this is right or wrong, and keep in mind, im no bungie dev. Just my thoughts on what could be causing this issue.