So I have been reading about some people not getting a key when they turn in their first queens bounty. I hadn't come across that issue until earlier today on my warlock but then I thought about it, I had gotten a key from an ether chest prior to turning in a bounty. Could that be the reason for not obtaining a key from turning in a bounty? Perhaps it is only meant for those who hadn't received one at all at reset from the chests.
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It's one guaranteed key per account not per character.