You must have at least Android version 7.0 (Nougat) installed. All previous versions are not compatible.
You must grant access, see below.
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In order to be able to connect to your Samsung TV (with Tizen OS), both your smartphone and your Samsung TV (with Tizen OS) must be in the same network.
It may be the case that your WiFi is in a different network than your LAN.
You can change this in your router!
Check the settings of your router. For more information, please refer to the instructions for your router.
Restart your router once and check it again after rebooting your router.
If that doesn’t help either, uninstall the app on your smartphone and reinstall it via the Play Store.
You can choose any other remote control, they should all be compatible.