Welcome to the Pet Rescue Community
Do you need help with your game? Ask the Community for help.
It might be due to the information given here:
https://care.king.com/en/papa-pear-saga/i-m-not-receiving-my-messages-lives-from-friends
It might be that you're not receiving them in the game in the first place. I also think if you refresh the game you lose any stored messages so keep that in mind!