Same issue here, I removed my champs for off season to allow another player to do objectives. They have removed their champs and defence is showing 9/10. Tried to join, begin button just isn't doing anything.
*update* Turns out the player that removed their champs to make space hasn't removed from all bg's. So check each difficulty of your maps and see if someone has still got defence in that shouldn't, that maybe is why you can't join.
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*update*
Turns out the player that removed their champs to make space hasn't removed from all bg's.
So check each difficulty of your maps and see if someone has still got defence in that shouldn't, that maybe is why you can't join.