There was an issue today when the Challenges swapped which caused an issue with rewards for the Pigeon Challenge. We have re-added the Pigeon Challenge, so that players can receive rewards for the challenge that ended today. This challenge will have 0 energy, and will last for 1 day. The challenge is being put up as a placeholder so that rewards can be sent out properly. During this time players need to log in to claim rewards for the Pigeon Challenge if they did not receive them. We will be sending mail in game to clarify this as well.
Thank you for the reports and patience!