Is There A Disney Plus App For Samsung Tv. Search for Disney Plus by entering it the search bar which is located on the top right corner of the screen and install the app. I guess an option would be to use it through the built in browser if it works.

There are two ways you can open an app. Unable to connect to Disney Plus. Then you can try adding your TV to the SmartThings app again.
Press the Home button to open up the TVs Home screen menu.
Search for Disney Plus by entering it the search bar which is located on the top right corner of the screen and install the app. If you have a compatible Samsung TV and you are unable to find the Disney app navigate to and select Apps on your TVs Home screen. Disneys new streaming service Disney works on the latest Samsung TVs without the need for a set-top box. Disney Plus app is available on Samsung Smart TVs from 2016 to all the later models with Tizen OS.
