I’m having problems here too. Discourse gets its SSO information from my WordPress site, and auth_overrides_email is enabled.
However, when I update the user’s email address in WordPress, no changes are made on Discourse.
I tried turning auth_overrides_email off, and while that removed the comment that it was managed by an authentication provider, there was never a pencil icon next to the email address, either for me as admin or when impersonating the user (which I did several times before turning the setting off to simulate the login/logout that was suggested above). All I could do was Show the address.
I turned auth_overrides_email back on and changed the address twice more in WordPress (to something else and back to what it should be), with no change.
Suggestions?