Trying to validate a subscription url but keep on getting "URL validation failed. Try again later." meanwhile the url is valid

having hard times submitting my marketplace app because of the webhook url, the url is valid, but say invalid, but when ever I change the domain with a ngrok domain it works, please I need help, this is my domain pulse.commsmessenger .com

Hi @GHL
Thanks for reaching out to us and welcome to the Zoom Developer Forum.
Can you confirm that you are implementing webhook URL validation on your end?

Ngrok is a known domain and hence validations are bypassed, but you have to make sure you are implementing this on your end