This forum’s account settings page says:
Email can be updated from SSO provider. Never shown to the public.
I tried to figure out what that means. I tried to sign into Single Sign-On (SSO) - Identity Access Management | Okta but was unsuccessful. But then in the Preferences page I saw a comment saying that some profile details are now managed through the SitePoint profile page and I was able to change my email address there. So it seems that the forum’s account settings page should be revised with current information.