On the Samsung instructions on howto do this it states on this page https://www.samsung.com/latin_en/support/apps-services/how-to-add-my-samsung-soundbar-to-the-smartth...
To Connect your mobile device to the same network
- Each device must be connected to the same Wi-Fi network
The TV connects to phone via SmartThings app .... but it does not recognise that Q800b is installed
Issue here my TV is connected to my home network by ethernet NOT Wifi, so how do I set up Q800-b to work on same App
