I have three characters. Every week I make sure to run at least one queen bounty to get the one key per week. But, after running the bounties, I never received a single key. I even checked to make sure that my inventory did not change on my 3rd character. On my titan, I started the week with one key, and still only have one key. Did this change in a patch? Is she not handing out a key every week?
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The guaranteed key from wanted bounties, is once per account per week. Your second and third characters can receive keys from the bounties, but it is a random chance, not a guarantee.