I have the same situation, but I am using an XR2 remote - not only does it not turn on with the tv, but it's not controlling the soundbar volume either So basically the only useful thing it does is turn on/off the TV.
Maybe if I configure the tv somehow to modify the volume of the soundbar, I can correct that issue (probably just doing it wrong), but otherwise, it doesn't look like there is a way to turn on the soundbar with the TV using the XR2 remote.
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