Email is not set up on this server, so no message can be sent. Use one of the two ways below instead.
Getting back in without email
Ask the other household member. While they are signed in, Settings → Household → Reset link next to your name produces a one-time link they can hand you.
From the server. Whoever administers the deployment can run node scripts/reset-link.ts your@email and read the link from the output.
To turn on email, set RESEND_API_KEY and MAIL_FROM on the service and redeploy.