Password reset email is disabled or missing
Forgot-password tried to send auth.password_reset, but sendTemplatedEmail reported not sent (template disabled or missing). Throws this error after a successful template lookup path that skips delivery.
Why this happens
The password-reset template is turned off or absent under Emails. Distinct from SMTP/Gmail delivery failures (mailer throws other messages) and from Invalid reset link (user-side URL problem).
Diagnose and fix
1. Admin → Settings → Emails — enable password reset / Auth templates; save.
2. Confirm outbound mail works (SMTP settings / Gmail XOAUTH2).
3. See How to edit an email template / Auth email templates.
4. Retry forgot-password; check spam if send succeeds but nothing arrives.