No surround sound from Chromecast Ultra

Thanks for the advice, right now I have it set up like you say, using optical audio from the xbox to the surround sound. However I had to set it to use optical audio on the surround sound receiver so it will not transfer sound from the Chromecast since it
uses HDMI. Not sure if there is an answer to this problem. :-(

Sad to say that this is still an issue 3 years later. I have a Dolby ProLogic receiver with the XBox One S connected to it via HDMI. When I try to play movies in Apps like YouTube TV the sound is horrible... flat, tinny, and only 2 speakers. I have tried
every surround sound option on the Xbox including bitstream and nothing is recognized by the receiver as surround sound. In contrast, I also have a Chromecast and it properly sends full, rich 5.1 surround sound over HDMI to the SAME RECEIVER. I was going
to use the Xbox as the centerpiece of my home theater, but this is a deal killer. It's beyond ridiculous that a $300 Xbox can't do what a $35 Chromecast can do.

I have other devices connected to my Marrantz, namely chromacast and 3d blue ray player. I jus tried playing a video on youtube through chromecast. It was an iron man 3 trailer, in hd and Dolby sound. When I play this video through chromecast, my AVR shows
me the sound output options of "DOLBY PLII MOVIE" and "DTS NEO:6 cinema" in addition to "multi Chn stereo". Playing the video on either Dolby or DTS gives me proper surround sound. Then I tried playing the same video on xb1 youtube. This time the sound options
were "multi Chn in" and "multi Chn stereo". Playing the video in multi Chn outputs sound from only front, center and sub. Surround speakers don't output any sound. I tried selecting bitstream, and select DTS/ Dolby there, but same result. I don't know what
my xb1 is doing this?

Thank you for the reply but this did not solve my issue. The links all speak to the basic setting options. I have tried every HDMI option within the settings and I get the same results.

Problem:

Hulu will not do 5.1 surround sound, no matter which option I pick. Either FR/FL no sub or just center.

Pandora will not play 5.1 surround sound only stereo FR/FL, no sub.

BUT- Netflix, Movies (except previews, which makes zero sense) and games do play just fine 5.1 Surround Sound.

I tested multiple HDMI ports and settings, even different HDMI cables.

I also plugged in my Chromecast to the same port from up stairs, zero issues, everything plays beautifully.

So at this point all I can figure is it is settings with the Xbox One not being able to transmit 5.1 surround sound on all of its apps (i.e. Hulu, Pandora).

I'm at my ends, really hoping someone who uses surround sound with a receiver and uses Hulu might be able to chime in.

hi, not sure if i can help, but ill try,

if you have chromecast connected and working leave it so,

connect tivo to xbox one via hdmi and use the one guide to set up and use an optic cable from xbox to surround system, go in to settings and audio settings, and set output to optic cable. you shouldnt need to connect the audio from the surround to tv (thats
the part thats confusing me)