Hello everyone!
The linking of an OpenMC Discourse account to a GitHub account from Chrome is not working currently neither on the Sign Up stage nor via pressing the Connect button on Preferences → Account after the sign up by email address.
In the both cases, the user is redirected to the same a 404 GitHub page, if the user is already signed in GitHub. If the user is not signed in GitHub then the 404 GitHub page is opened right after the successful GitHub authentication.