Same haven’t been able to play this patch. I think I’d completed a run but not claimed the reward, then the patch has happened making those rewards bugged. It happened last patch too, if this forum post is anything to go by: Heroic Duels- Stuck on Chest Reward - #54 by DD4Lyf-1334.
It’s affecting me on mobile and on PC.
@BlizzActiKingCrosoft people, pretty please can I test for you by installing the old client going through the reward screens then re-installing the new client ???
Duels is really the only gamemode I still play!!