After following the instructions, the sample code is returning the invalid_scope when trying to go to the following url:

https://login.uber.com/oauth/authorize?scope=profile+history&redirect_uri=http%3A%2F%2Flocalhost%3A7000%2Fsubmit&response_type=code&client_id=YOUR_CLIENT_ID

Replace YOUR_CLIENT_ID with something that works.