That’s great that you found that. If you are finding references to the enable_sso setting in the WP Discourse plugin’s options pages, those references should have been changed to use the new enable_discourse_connect settings name in the most recent release of the plugin (version 2.3.0.)
If there are still references to the old settings name in the plugin’s documentation on Meta, we’ll need to get those updated to use the new settings name. I’ll double check that at the beginning of next week.
Note that while configuring DiscourseConnect, as an admin you can bypass SSO login by going to your Discourse site’s /u/admin-login page. Enter your email address into the form on the page. A one time login link will be emailed to you.