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Bought a new 75R635 TCL. It plays Dolby Atmos content on the TV's speaker, but when I connect TV to Samsung K950 soundbar, Dolby Atmos disappears.
I tried to connect a laptop to Soundbar HDMI and then route back to the TV via Arc, Dolby Atmos on the soundbar worked. If I connect the laptop to the TV first, then still no Dolby Atmos.
Seems the workaround is to get an external player to connect to Soundbar, instead of using the ROKU player on TV. How frustrating. Together the set is nearly $3K and it is not working as advertised. Considering returning the TV... 
