My app is not able to read the Orders data with the exception com.clover.sdk.v1.ForbiddenException: status code: 403 App doesn't have required permission: ORDERS_R.
I've found a similar incident at Permission Error "app does not have permission ORDERS_R" but the solution provided there did not work in my case.
My app is in the sandbox account and the other apps that I have created before is working fine without any permission problem.
I have created the app via regular app creation flow (not the quick create app flow, because I could not create the app via quick create. The "Create Quick App" button stays disabled even after filling out all the fields).