Attempting to setup OpenID Connect plugin for Google oAuth 2.0 (which is OpenID certified), I was unable to do this due to the following error on Google's side -

400. That’s an error.
Error: invalid_request
Missing required parameter: redirect_uri
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Request Details
resource=https://www.googleapis.com/oauth2/userinfo
scope=openid profile email
response_type=code
state=Vd2WqGYiKpMlEh1
nonce=N572bf97655e84
client_id=361112190504-80lvin0ne7oug13cc7ug47hf7d0bqtod.apps.googleusercontent.com
response_mode=form_post

As can be seen the request details, the plugin fails to pass in the redirect_uri. Google seems to expect this paramenter to passed in the URL (as occurs with oAuth2 Mooodle plugin which works with Google). The redirect_uri is specified in the settings as being https://sitename/auth/oidc/, but this is not passed in the URL by this plugin.

Can we get this parameter added to the URL to create compatibility with Google's OpenID interface?