DiscourseConnect / SSO. 親ウェブサイトからのリダイレクト後にユーザーにメールの提供を強制する

Hi.
We authenticate our users via our website, but we don’t have emails on our side, so we pass a fake email field in sso payload (${userId}@no-email.invalid).

Is it possible to force new users to specify their email addresses and validate it via Discourse?