Using Cloud function URL as Event notification endpoint URL

Hello,
I am facing an issue in validating the webhook endpoint in zoom webhook app.
So i’ve created a Webhook only app and i deployed a cloud function on GCP that executes agent status change upon receiving webhook notifications from zoom.
The trigger url of the cloud function is
https://<<region-project_id>>.cloudfunctions.net/Agent_Status

when i use this url in the “Event notification endpoint URL field” and try to validate i get the error “URL validation failed. Try again later.”

can you please assist with this issue?

Regards,
Ahmed