WhatsApp error 131000 Unknown error stopped the message

Transient — may succeed on retry Meta-side Sending and connection errors

Short answer

An unexpected WhatsApp error occurred while sending, and the message did not go out. WhatsApp gave no specific reason for the failure.

Checked against Meta docs on 2026-08-24 Official source

How to fix it

Send the message again.
If the error keeps repeating, contact support so the case can be raised with Meta.

Meta's official wording for this code

Description Message failed to send due to an unknown error. Meta's suggested solution Try again. If the error persists, open a Direct Support ticket. For WhatsApp Flows with Endpoint - when setting a business public key, it either failed to calculate the signature, call the GraphQL endpoint, or the GraphQL endpoint returned an error.

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Common questions about this code

What does WhatsApp error 131000 mean?

An unexpected WhatsApp error occurred while sending, and the message did not go out. WhatsApp gave no specific reason for the failure.

Can I just send the message again?

Yes. This error is transient, and the send may succeed on a retry with no changes.

Is this a problem with my account?

This sits with Meta; there is no direct action on your side.

Still hitting this error?

Send us the code and a screenshot and we will read it with you. With LetsBot, the reason each message failed appears next to it in the campaign report instead of a bare number.