The system doesn't notify you when someone blocks on iMessage. You must look for signs and clues to confirm your blocked ...

In this guide, we explain how to know if someone blocked you on iMessage (or at least how to ... you sent to the person in ...

Also, try the following methods to see if you have been blocked ... The first thing you can try is to send the person an iMessage. If you are not blocked, it will show as Delivered.