Getting Subscription validation failed.Must respond with 200 OK error
I was trying to create a subscription using Microsoft graph API. We have exposed a notification URL which on receiving the post-call from the graph API will respond with the validation token and also status code: 200 OK.
When I tried hitting the subscription API for creating subscription it is showing "Getting Subscription validation failed. Must respond with 200 OK"-error. And At the same time, we are getting Status: 400 Bad request in postman.