Some of my friends can't message me in Messenger. I deactivated my Facebook account last February and we can still communicate through Messenger as it should not affect the app. Just this week I was informed by a relative that she can't send me messages, I can send her a message but she can't reply back. I now have more than 4 friends who can't message me through this app, with error saying I'm unavailable in Messenger. Already activated my FB account but nothing changed.