Call back URL gives 404 error

[sridharvaranasi]

I have created a Web app in Azure using the node js code provided in this repository. My web app is unable to process the GET request from Facebook. It is giving me the below error message.

The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.

In the logs I can see that I am getting the below error:

2019-04-09 05:19:41 TEST-INSTAAPP GET /facebook hub.mode=subscribe&hub.challenge=1608055879&hub.verify_token=abcdefg12345&X-ARR-LOG-ID=74a3c3bb-390f-4de0-8e4d-700f576993b6 443 - 66.220.149.37 facebookplatform/1.0+(+http://developers.facebook.com) - - test-instaapp.azurewebsites.net 404 0 2 419 1106 15

Can anyone please advice me on how to resolve this issue?