So I came back recently like so many others and I am trying to rank up my guardian rank once again. I am stuck on rank 6 "earn a Prime Engram". I am power level 406, and have been playing consistently since the June 9th update, yet not a single "Prime Engram". Just ran a fireteam ops with they spouse, who has been playing significantly less than me and is only level 321, and they just recieved one which completed the challenge for them. Is this a known bug, am I just that unlucky?