I am having the same problem with 2 Samsung TVs that we bought in mid-2018. They are listed as compatible devices. We resolve it temporarily by unplugging the TV then plugging back in then the app seems to work. This resolution came from a Customer Service rep but we did not think we would need to do it every time we want to watch on the app. It would be nice to not have to do that every time since we have our TV on the wall and I have to get a step ladder each time to unplug/replug the TV!
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