WhatsApp error 33: Parameter value is not valid

Code 33 on the Cloud API means the phone number ID in your request path points at a business phone number that no longer exists. The Graph API's generic title for this code is "Parameter value is not valid", but Meta's WhatsApp documentation is more specific: the business phone number has been deleted. The platform is not rejecting your message content; it cannot find the sender you named.

This usually follows an account event rather than a code change. Someone deleted the number from WhatsApp Manager, migrated it to a different WABA, or tore down a test WABA whose phone number ID was still hard-coded in a config file. The ID is a long numeric string that looks nothing like the phone number itself, which is why stale IDs survive unnoticed.

Your token, templates, and recipients are all fine. The request is simply addressed to a sender that is gone.

Resolve phone number IDs at startup by listing the WABA's numbers and matching on display_phone_number, rather than hard-coding IDs. Emit an alert on code 33 because it signals an account-level change, and keep WhatsApp Manager deletions behind a change-management step so production IDs are not removed without notice. A number that exists but was never activated raises 133010 instead; number lifecycle problems are covered end to end in the registration troubleshooting guide.