@M34: There's a couple of ways that you can connect your Note 10 to your TV.
1. Download the SmartThings app on your phone > Open it > If you see a pop up for your TV, select Add Now. If not, go to Devices and select your TV.
2. Swipe from the top of your screen to the bottom, then again to maximise the Quick Panel > Smart View > Select your TV, and follow the on screen prompts.
If the above isn't applicable, please can you confirm the model number of the TV you're attempting to connect to? Also, please confirm the full error message that you're seeing when the connection fails.