Here are some steps to try and determine why your Smart TV might not compatible with certain apps:

1. Check your internet speed to ensure it is suitable for streaming.
2. Ensure that both your Smart TV and the app are up to date.
3. Check the app provider website to confirm that your Smart TV is compatible with the app.
4. Check your Smart TV manual or contact the manufacturer to find out more about its compatibility with different apps.
5. Check to see whether any other devices connected to your home network are preventing the app from connecting.
6. Double check that you are connected to the right network.