Starting about three days ago I have not been able to fight in the training rooms for an unknown reason. The game is always telling me it can't find an opponent, and when I try to fight someone in the room a message comes up that says they have a deck that is not compatible for this room even though it says they are currently playing in it ! Sometimes a message will come up telling me my deck is to strong, but even when I change who is in it I still have no luck . Does anyone know how to fix this??
Define 'training rooms'.
If you mean rooms like 'Welcome to Town', 'Safe Neighborhood', and/or 'Central Zone', then you just over leveled (only 20 and under allowed, Danger Zone however extends 21-30).
If you are talking about Lost Warehouse, then you need at least one un-leveled card.