Webhook error

I am unable to configure the webhook in the integration with Whtsapp.
I'm hosting at Vercel Hobby.
Here is the error that appears in Meta Developers:

Callback verification failed with the following errors: curl_errno = 28; curl_error = Operation timed out after 6002 milliseconds with 0 bytes received; HTTP Status Code = 200; HTTP Message = Connection established

Callback verification failed with the following errors: curl_errno = 28; curl_error = Operation timed out after 6002 milliseconds with 0 bytes received; HTTP Status Code = 200; HTTP Message = Connection established

Callback verification failed with the following errors: curl_errno = 28; curl_error = Operation timed out after 6002 milliseconds with 0 bytes received; HTTP Status Code = 200; HTTP Message = Connection established

Callback verification failed with the following errors: curl_errno = 28; curl_error = Operation timed out after 6002 milliseconds with 0 bytes received; HTTP Status Code = 200; HTTP Message = Connection established

In Vercel logs: 504 Gateway Timeout

What could be causing this?

Webhook error

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