I ranked up to Mythic I in my Infamy at the same time as I completed my weekly Gambit challenge, however I only received one Powerful reward (a 552 Bygones). I assume this is from the weekly challenge since it is only 1 higher than my max light. I believe this means I never received my Infamy Rank Up powerful package, and I never got the banner that usually flashes across the screen when you rank up. I tried going in and playing another match and that did not work either. I also redeemed a bounty since I ranked up and that didn't trigger it either.