There are a few telltale signs that someone may have blocked you on Facebook Messenger. One sign is that you no longer appear in that person’s list of contacts. Additionally, if you try to send a message to the person and it doesn’t go through, this is another sign that you may have been blocked.
Video – How To Tell If Youve Been Blocked On Facebook Messenger
If you suspect that you have been blocked on Facebook Messenger by someone, there are a number of ways to check.