I've done the setup and confirmed it 'should' work, but when I click 'link' (the initial facebook request comes up) I get:
The requested URL /ucp.php&oa_social_login_login_token= was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
What exactly is going on?
Could you provide us with more information such as: which version of phpbb (we suppose it is phpbb) are you using, which version of the plugin (did you download it from our web site?), the scenario that lead to the error (did you first register a user, then in the UCP for that user, tried to link it to a social network, and then got the Not Found error ?).
Sorry for the hassle.