How to forward Gmail messages to WhatsApp Business without errors

Hi ​@Danny143 

You can try:

1. Check your "Name" field

This is the most common culprit for Gmail → WhatsApp setups. The From Name from Gmail often carries invisible line breaks or tab characters that WhatsApp rejects.

Quick test: Replace the dynamic {{from_name}} field with something simple like ”Alert” and test again. If that works, you've found the issue. Then add a Formatter step before WhatsApp to clean up the original name.

2. Try a different template

Some WhatsApp templates are pickier than others about what data they accept. One user fixed the exact same error by simply selecting a different template in the "Template" field .

3. Check the "Link to Reply" field

If your template has a field for a URL, it must contain a properly formatted, complete URL. An empty or malformed URL will trigger this error .

Hope this helps you!

If you’re still running into issues, could you share a screenshot of zap setup and a quick description of what your Zap is doing? That’ll make it much easier to understand what’s going wrong
 

Hi ​@Danny143 

Help links for using WhatsApp Business Zap app integration: https://zapier.com/apps/whatsapp-business/integrations#help

For us to have more info about what you are referring to, post screenshots showing how your Zap steps are configured in the CONFIGURE tab while in EDIT mode with the field mappings visible.

The error is usually caused by the WhatsApp step receiving a value in the wrong shape, even if the visible text looks short.

I would isolate it like this:

1. Add a temporary Formatter/Text step before WhatsApp and output only the exact message body that will be sent.

2. Remove hidden line breaks, unsupported characters, and any copied email headers/signatures from the Gmail body.

3. Confirm the phone number is in the exact format required by the WhatsApp Business connection, including country code and no extra spaces.

4. Test with one fixed hardcoded message first. If that works, the issue is in the Gmail-parsed fields, not the WhatsApp connection.

5. If the Gmail body is dynamic, map a cleaned summary field instead of the full raw email body.

I would also keep the Zap as Gmail trigger -> clean/shorten message -> validate recipient number -> WhatsApp send. That makes it easier to see whether the failure is message formatting or account/recipient configuration.

Hi, ​@Danny143, Has this been resolved yet?

If Not, If the message is under the character limit, I'd look beyond the message length. Error #100 is often related to the payload format, mapped fields, or the recipient configuration rather than the content size itself.

I'd check the full error details from the test step to see exactly which parameter Meta is rejecting.

Happy to take a look if you'd like:

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Hey ​@Danny143 👋 Did any of the suggestions from folks here help you get that error sorted?

Let us know how it went, want to make sure you're all set! 🙂