With my tests I received a notification of a new thread but not of a follow up post.

I'll try again with a post here and see what happens...

It's possible that's because you are replying to yourself. Did you receive a notification that I have replied to you?

Hmm...I didn't receive a notification of the replies here either, even though I'm showing as subscribed to this thread.

There might be an issue.

I've adjusted the plugin, starting a new thread would be best. I'll do that and have one of the admin accounts comment which should send you a notification. Let's try it...