Adding a webhook for Jira notification on Zoom but unable to validate

[hitendave]

Hi All, 

I am trying to set up notification from zoom to our jira instance, where someone request an app from Zoom Market place, it should create a service request in Jira. 
but I am unable to validate the hook using our jira instance url. 

looks like it fulfills the requirement but not sure what I am doing wrong. 

please assist.