SLKR v SLKR - no one could die

This has been an known interaction since DV Rey joined. It's due to Rey's unique of her allies can't be killed until all enemies have taken a turn. She can remove 100% tm from everyone, meaning she stays untargettable in mirror situation. You either have to use Hux (if he is faster than Rey) to pass turns to your slowest allies so the enemy Rey can be killed, or better option, don't do mirrors.