Only the very first character to turn in the very first bounty gets a key.
Like i got one for my main and then when i did my 2nd characters first bounty ingot a Mote. So only 1 key a week guaranteed per account for bounties.
not trying to brag here but I literally got two from one set of bounties after getting my freebie for the week. has anyone else had this happen to them?
edit: OP you are only guaranteed one key across all characters (provided you do one queens bounty) per week not one per character per week if that clears anything up.
You are guaranteed one key for the first bounty completed that week on one character, every other time after that first key, it's just a chance to drop on another character
I believe if you had a wanted bounty from the previous week will make it not give you a key. This may be because last week bounty rewards did not offer a key, so when turned in it counted as you getting one when you really didn't?
I did my hunters bounty first and got a key, then I did it on my warlock and didn't. My warlock happend to have a key in his inventory when turning in the bounty so I wondered if that anything to do with it. Then I made sure no keys were on my titan when I turned in his bounty and got a key. Hope this helps.
Edit: This was only on the first wanted bounty per character. idk if you can do it again if you didn't get a key the fist time. I'll try it again on my warlock and update my post when I do.
Edit 2: I just realized that my warlock had some wanted bounties from last week and I turned some of those in along with a new one. This might have been the problem especially if I turned in an old bounty first. My titan had some old bounties too, but I dismantled them all before I even picked up the new ones.