I have exactly the same problem! Upgraded from an S7 where this worked no problem. Now smart view won't find either of my TV's using the S9 but it will the Google home speaker. None of my settings have changed, same WiFi network etc.. Again I can find them to screen mirror but that's useless because then I can't use my phone for anything else. This is something on the S9 that is broken..... What is the fix please because this is very VERY annoying!!
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