You need to get at least 10 banners to receive rewards at the end of a round. You get those 10 points by simply attacking for the first time (regardless of win or loss). It's possible that you have to actually complete the battle and that crashes don't count (as it doesn't register as a completed battle). You should have just sent in another team, get the 10 score, and then call it a day. Crashes are indeed unfortunate, but if you are too lazy to even get 10 points, and give up immediately, then I'm also wondering why you keep playing. Next time just beat any 1 team your opponent set, and then stop if you don't feel like playing. That way you will have your guaranteed 60 or 70 something score and will get your rewards for sure.
