After working with Nathan, it looks like the only required field within Prisma is the Webhook URL itself. The Auth Token is not required (image below) to be inputted to Prisma because the Auth requirement is already built into the Webhook URL.
After the the Logic App is setup you will new need to enable the alerts to be sent to the Logic App within Prisma.
Logic App listener URL
Prisma Webhook setup
Alert destination, Enable Webhook
Also, thanks to Nick DiCola (who I was unable to mention because the post was rejecting the it)