Maybe I messed a setting or maybe this is some weird bug.
I added Instagram for my own account that matches my admin email address.
After authenticating, it's asking me for an email address since I have Bouncer enabled. I enter my matching email address that is my Instagram one as well as site Admin email and get a 'That E-mail is already registered!' error on the login form.
Shouldn't WP Social Login match and log in with Instagram in this case or have I got it's logic incorrect?