I am the 2nd person in my Guild to have this issue. We have both won the first 3 battles, but the 4th one won’t start. You can click on it and it “pops” out like it should, but there is no picture in the box (just the ?) and it won’t start.
I am on a Galaxy S8
Android version 7.0 “nougat”
I have tried both on WiFi and not. I have also restarted my phone.