We have a client who is on Pantheon and we are having issues with the latest version of the plugin and the "Invalid state" error. Looking at this troubleshooting guide I have a pretty good idea what the issue is (https://github.com/joshcanhelp/troubleshooting-invalid-state-wp/) based on step three of the plugin's new process.
The problem is that Pantheon Wordpress cookies have to have STYXKEY_ at the beginning of their name or they are unreadable. As such, I believe that there is a change the auth0_state cookie is not being seen by our site.
Is there a way for us to override the cookie name to STYXKEY_auth0_state perhaps or maybe a new setting field can be added where the cookie name is set?