I am trying to create a Jenkins webhook to a Jenkins URL and getting an "Invalid URL" error
http://<URL accessible only via a VPN>/bitbucket-hook/

Can anyone please confirm that this is caused by an inaccessible URL because of the way this is blocked from outside access ? We can then work toward opening up the firewall for access to Bitbucket Cloud.
Are there any better ways to access Bitbucket webhooks ? There is a pre-configured webhook - https://bitbucket-prlinks.us-east-1.prod.public.atl-paas.net/webhook/pr that I can see when I click on "Webhooks" but I am not sure how I can call it in Jenkins.