Me and multiple people i talk to have all the same issue, as soon as we need the puzzle pieces to keep playing and try to send request from the people who play their names don't show up and finally after trying 50 times their name might show up and can send a request but it never shows up on their end and yes we both have excellent internet connection on wifi. I think it's probably the worst idea to have a 72 hour lock in my opinion, help me play your game at least.
