Oh yeah, your receiver has to know how to pass Dolby Vision for sure. HDR pass thru usually just implies HDR10. Denon didn't start shipping Dolby Vision on the unit until this year's 2017 models, they are patching 2016 (and some 2015 models)
You can't really blame them either as h tim recently there weren't any devices or content needing to do Dolby Vision over HDMI
Wow.... I thought it literally just let the untouched video signal go through so that the display would decode it.
I guess I need yet another receiver soon.
Perhaps I should just wait for 2.1 at this point.