I just updated the software on my QN55QN90AAFXZA and low and behold it up my Smartthings. When I press the home button and tab over to the Smartthings icon I now get on the line above, Smart Device not connected. All of the Smartthings devices used to appear on that line, but no more. It hit or miss whether any of the notifications work or not. Software version 1904 at least worked.
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I can definitely understand how frustrating this may be. I recommend reaching out to our SmartThings team. They can be reached at 866-813-2404 or emailed at firstname.lastname@example.org