Ok, problem solved.To sum up :
- This module works fine, there is just a bug with the Drupal user picture, but a patch is pending,
-
This post is wrong about the settings in Discourse : the sso_url should end with
/discourse_sso
, NOT/discourse/sso
- If you want to be able to login with several different accounts, you must set
http://mywebsite/user/logout
as the logout redirect, and disable Ghostery in your browser for your discourse website if you’re using this plugin.
Thanks for your help, @simon !