# WhatsApp Flows public-key-signature-verification Error - How to Fix
Author: Prashant Jangid
Author URL: https://www.heltar.com/blogs/author/prashant-jangid
Published: 2025-03-17
Category: Troubleshoot
Category URL: https://www.heltar.com/blogs/category/troubleshoot
Tags: WhatsApp Flows Error
Tag URLs: WhatsApp Flows Error (https://www.heltar.com/blogs/tag/whatsapp-flows-error)
URL: https://www.heltar.com/blogs/whatsapp-flows-public-key-signature-verification-error-how-to-fix-cm8d40k29008gtbw9cddrxgyj

The **public-key-signature-verification error** occurs when the client fails to verify the signature of the business’s public key. This prevents secure communication and disrupts WhatsApp Flows.

## What Causes public-key-signature-verification?

This error happens due to:

1. **Incorrect or Missing Public Key –** The uploaded public key does not match the required signature.

2. **Reinstalled On-Premise Client –** If you recently reinstalled the on-premise client, the public key signature may no longer be valid.

3. **WhatsApp Server Issues –** Temporary server problems may interfere with key verification.


## How to Fix the public-key-signature-verification Error

Follow these steps to resolve the issue:

### 1\. Verify the Public Key and Signature

Go to [WhatsApp Business Manager](https://www.heltar.com/blogs/how-to-access-whatsapp-manager-on-meta-business-manager-cm58dt4sr001sx9tqqhi8rmgo) and ensure the correct Flow public key is uploaded. Confirm that the public key includes a valid signature.

### 2\. Re-upload the Public Key (If On-Premise Client Was Reinstalled)

If you recently reinstalled the on-premise client, re-upload the public key with an updated signature. Ensure the key is correctly linked to the phone number used for sending Flows.

### 3\. Retry and Debug

Wait a few minutes and retry sending the Flow. Check API logs for additional error messages.

### 4\. Contact WhatsApp Support

If the issue persists, reach out to [WhatsApp Business Support](https://www.heltar.com/blogs/how-to-raise-a-support-ticket-on-meta-business-in-2025-cm5ezmb8l00em51ztj2uu34mc).

By following these steps, you can fix the public-key-signature-verification error and restore WhatsApp Flow functionality. For more troubleshooting tips related to WhatsApp API, check out [heltar.com/blogs](http://heltar.com/blogs).


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