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With “HDMI IN” selected, my Xfinity XR11 using code 31937 turned on my Vizio SB3661-E6 properly. HDMI input was from the Xfinity/Comcast wireless cable box. Vizio output was HDMI to my Samsung TV. I had no Vizio apps on my iPhone.
How is the soundbar hooked up? Do you have:
X1 ==<HDMI>==Soundbar==<HDMI>==TV ?
If so, there's probably a setting on the TV that involves CEC/HDMI link that conflicts with the XR11. You could try disabling that, or, since you don't have HDMI-ARC on the TV, I suggest using the soundbar's Optical input and connect it to your TV's Optical out port with your soundbar's included optical cable.