Can't play DUEL mode

[Nungwiman-2908]

This is a known issue,
solution:

Stuck on Duels Rewards Screen

We’re aware that some players are stuck on the Duels rewards screen after a Heroic run. We’ve identified both the cause of the issue and a solution to the problem, which will be included in our next major patch (22.4). We’ve also identified a workaround that can be used to circumvent the issue in the meantime: Log into Hearthstone on a mobile device. Navigate to the Duels mode. Tap on the part of the screen where the button to collect rewards would normally be if it weren’t missing (the handle…