If you are getting the "no location found" message when finding a person you were able to locate in the past, it is possible that they may have blocked your account. However, there may be other reasons this could be happening as well, so it’s a good idea to troubleshoot further before jumping to conclusions.   It is also possible that the other person just restricted you from finding his or her location and did not block you totally. Because if that is the case, chances are you will not be able to send them iMessage as well. If you want to know for certain if someone blocked you on iMessage, we suggest that you read our article that explains in detail how to do that.