Since a few weeks I have this problem:* I can cast youtube to my Samsung Q9 tv when using Google Chrome.* When I try to do the same thing with any other webpage, I get a "tv not supported" when selecting "cast".Many people seem to have the same problem, but I don't find any solution.
Did you manage to get this working? Could we take the model code and current software version of your TV? Go to Home > Settings > Support > About This TV.