Unable to validate web hook

We have an OAUTH application which was migrated from a JWT application. The JWT application worked correctly with our webhook . After the JWT application was deactivated, we stopped receiving traffic at our webhook. We are attempting to add the webhook to the OAUTH application, but it is failing validation. We are not seeing any request come to our server.

Here is a tutorial on validating webhooks: https://www.youtube.com/watch?v=x2ZvARwlQNk&ab_channel=Zoom