The CW tv app was recently updated and it no longer works on my QN75Q8 TV. The app works on my Tab S8 and used to work on my TV until the latest version of the CW app. My TV is current on it's software.
That does sound frustrating! I suggest uninstalling the app and following the steps in this link. If the link doesn't help, and the CW app is the only app you're having issues with, you will need to reach out to the developers directly. It's possible the update messed with the code in the backend causing it to not communicate properly with the TV.
