WhatsApp error 133004: Server Temporarily Unavailable

Code 133004 is a transient failure from the registration service. It is returned by registration-related calls (register, deregister, request_code, verify_code) when the component handling them is briefly unavailable. Unlike 2 or 131016, which concern message sending, 133004 is confined to account and phone number setup, and it is usually seen during onboarding automation or migrations rather than in day-to-day messaging.

Meta's guidance is to check the WhatsApp Business Platform status page and the details value in the response, then retry. The details field sometimes includes a hint such as a wait time, so read it rather than retrying blindly.

Nothing about your PIN, phone number, or token is being judged here; the service simply could not answer. The registration did not complete, so you will need to issue it again.

The error is synchronous to the registration call that triggered it, and from your side of the wire it is indistinguishable from a real outage - which is why the status page, not your configuration, is the first stop. If registration keeps failing after the platform recovers, the systematic checklist in the registration troubleshooting guide covers the deterministic causes, starting with the PIN mismatch.

Write onboarding and migration automation so that each registration step is retryable with backoff, checks the number's state before and after, and stops well short of the attempt limit. Surface 133004 to operators as "try again shortly" rather than as a hard failure, and keep the status page handy during planned migrations.