Oauth error invalid_request: The redirect_uri is not whitelisted

[Daniel__dev]

Oauth error invalid_request: The redirect_uri is not whitelisted

Im creating app from doc - get the error the app works with ngrok but the error appears while pushing to heroku

Oauth is connected here is the video -> https://www.youtube.com/watch?v=F_0tUl7P_DA

[Daniel__dev · Accepted solution]

Here is the solution 
HOST={your app's host} # Your app's host, without the protocol prefix