Basil:I just authenticated Food Network on my device.
Try the following. All steps. This order. Do not vary.
- Remove the app.
- Reboot the Roku.
- Add the app to Roku.
- Open a browser and log in to your content provider, whether cable (Xfinity, Spectrum, etc), satellite (DISH, DirecTV, etc), or streaming service (Sling TV, DirecTV Now, Philo, etc).
- Launch the app on your Roku. Go to the settings tab and attempt to authenticate.
If you are unable to perform the steps in this order, or run into something unexpected at any step, stop and let us know what went wrong and where.