Wordpress new-user registration e-mail not sent out when registering with Wordpress-Social-Login

As the title suggests, our Wordpress site will correctly trigger the 'Activation', then 'Welcome' e-mail workflow to users that signup via the the non-WSL (Wordpress Social Login) route. Users that signup via WSL do not trigger the 'Welcome' e-mail, which is a problem.

To be honest, my best guess is that perhaps it has to do something with a non-WSL user trigger the chain of events that starts with a user 'activating' their account, which then fires off the subsequent e-mails.

Any help would be much appreciated.

via Chebli Mohamed