How do you get the messages "A friend responded to your request for a Mystic Map. Why not pay them a visit?" to drop off your messages. I've had them linger for as long as 7 days.
Every day I use them to visit my neighbors but that doesn't make them drop off either.
It causes more recent notifications that someone has visited to drop off before I can respond and visit non-neighbor islands in return.
Thanks for the help.