New User Registration Confimration Email

I have been searching for a few hours now and con not find a resolve. I have recently experienced issues with the new user registration. This has worked fine for me previously but know the email is not being sent to the new user. I am getting notification as I am admin but the user email is not happening. I have turned off all plugins and still nothing. I use a paid theme Flatsome
Does any one have any ideas I don’t want to have to install another plugin in I can help it?
Thanks
Kylie