'How to construct valid event Webhook endpoint/url for OKTA Event Hook?

I have created AllowAnonymous HttpPost action method i.e UserUnassignedFromOktaAsnc and trying to configure in Okta event Hook endpoint

if a okta user get unassigned from okta portal , UserUnassignedFromOktaAsnc action method will be called to de-active user and prevent login.

our Enterprise application has been built on asp.net MVC 4.5 and deployed in Azure App service.

It seems we can't directly configure endpoint in Okta, Okta document suggest we have to construct event hook endpoint/URL through ngrok or hookdeck.

I would like to know

  1. Is there any other way to construct okta valid end point/URL?
  2. Do we also need to deploy ngrok or hookdeck along with Enterprise application in Azure App service , and must be up and running.

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