[Plugin: WP-FB-AutoConnect] Not sending email to the user after user registration by wp fb autoconne

Hi sir/mam. Please help me, when user logged in to my site using wp fb autoconnect for the 1st time, the user is automatically registered in my site its awesome! But the problem is, the user does not recieve the user registration email. I want them to recieve email of their user account details. How can i do that?

https://www.ads-software.com/extend/plugins/wp-fb-autoconnect/