WhatsApp error 100 WhatsApp rejected a value in the message

Needs action from you first You fix this Sending and connection errors

Short answer

The request included one or more fields that WhatsApp does not support or that were misspelled, so the message was not sent.

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

This code covers 2 different cases

Meta returns the same code for different reasons, and each one has a different fix. Match the English text you were shown against the cases below to find yours.

Case 1

WhatsApp rejected a value in the message

The request included one or more fields that WhatsApp does not support or that were misspelled, so the message was not sent.

Check that no value in the message is longer than the length allowed for its type.
If every value looks correct, contact support to review which field WhatsApp rejected.

Meta's official wording The request included one or more unsupported or misspelled parameters. Suggested solution See the endpoint's reference to determine which parameters are supported and how they are spelled. For WhatsApp Flows with Endpoint - ensure when setting your business public key, it is a valid 2048-bit RSA public key in PEM format. Ensure there is no mismatch between the phone number ID you are registering and a previously stored phone number id. Ensure your parameter is under any length restriction for the type.

Case 2

Message refused — a template message is required

The message you tried to send was not a template message, and this sending channel accepts template messages only. That is why WhatsApp refused it and it was not delivered.

Send the message again using a template categorised as Marketing instead of a free-text message.
Make sure the send is set to go out as a template, then try again.

Meta's official wording (#100) Invalid parameter. Message must be a template message. Suggested solution You are attempting to send a non-template message. Message type must be template. Try again using a marketing template.

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Common questions about this code

What does WhatsApp error 100 mean?

The request included one or more fields that WhatsApp does not support or that were misspelled, so the message was not sent.

Can I just send the message again?

Not before the cause is addressed. Complete the steps above, then send again.

Is this a problem with my account?

You resolve this from your own account settings.

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.