New Message Notification Email

I have set up the new message notification email same way as I did for welcome email and new listing email but it is not sending out for me at all. The others I’ve no problems with. Please see attached email, is it something I’ve in / not in? Thanks

p.s I have tried sending one of the other emails instead of the new message one I created in its place and that also didn’t send. So I don’t think it’s with the actual message, it’s to do with something else