Whatsapp API Certificate problem?

Cristian_Martanov · December 23, 2025, 10:32am

Whatsapp API Certificate problem?

Hello! My workflow is not sending Templates even though i set everything up correctly. Might it be the number?

What is the error message (if any)?

Error code 400

What Im guessing is the problem is that the number has not registered the certificate and I have no idea how to do it.

image1451×342 44.1 KB

Is this why the flow is not working?

Any idea on how to connect the phone certificate? I looked everywhere but I could not figure it out.

Thank you!

PS": credentials work, i can see my phone number and templates.

achamm · January 18, 2026, 7:38pm

Looks like you’re running into a common issue with WhatsApp API. You need to register your phone number’s certificate within the WhatsApp Business account settings, not within n8n. This step is essential for sending templates.

Let me know if this works!

system · April 18, 2026, 7:39pm

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