In general, the invalid loot error is caused by your game and the server becoming out of sync. Sometimes, you can resolve the issue by force closing the app and then restarting the game. When you encounter this behavior, any stamina and raid tickets you spent for that battle are automatically returned to your account.There are some cases when the error is persistent. After 24 hrs if you are still experiencing this, please contact support to let us know and we will pass it along to the team to investigate.
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Portal Quest GUIDE