Setting up Rest Authentication

I have set up the authentication Provider as bellow, and I’m using the authentication provider for my REST Data Source.

Though, when try to use the model Skuid returns an error that ‘scope’ field is missing, even though I provided. As per image bellow (sorry for hiding rest of it as I don’t know what is sensitive):

I am not sure if callback url should be filled in auth provider, or am I doing something else wrong.

I have used exactly the same information in Postman and it worked.

Thank you.

Bump, would appreciate any help with this. Thank you!