I've posted about this before... I'm not sure if this is just how Minds works, or if it's a bug, but tagging someone in the body of a post does not give them a notification. I *think* it used to work, but now I'm second guessing if it ever did. I finally reported the issue to Minds, to see if it is a bug or just how Minds works. If I get an answer I'll post it here.