We could not send the verification email — configure outbound mail
Registration or resend hit AUTH_VERIFICATION_EMAIL_FAILED (503). Product: configure outbound mail in Admin → Settings (Email), then try again.
Why this happens
Mailer threw while sending verify mail (credentials, TLS, Gmail not authorized, etc.). Distinct from template-disabled and from Could not send the verification email — check mail settings (admin issueUserVerificationEmail wording).
Diagnose and fix
1. Fix SMTP settings or complete Gmail XOAUTH2 / Connect Google.
2. Enable verification templates under Emails.
3. Retry register or resend; use admin send-verification once mail works.
4. Delivery checklist if the API succeeds but inbox is empty.