Some users have been reporting that they are not able to claim guild wars rewards, despite knowing they've done more than 10 battles. One option is to try attacking in guild wars, force close the app to log out, then log back in. That worked for me last season when my rewards were stuck. (But haven't had this issue this season, so not sure if this will still work since we recently had an update.) If that doesn't work, submit a support ticket either through the in-game customer service center or through this link.