Amber, I am listen as I type to a Chromecast Audio playing HiRes 24bit 192 kHz through an optical cable into my Chord DAC. It is working perfectly and sounds great.
So I would say no need to go after cheap Chromecast rip offs, go for the genuine thing which are still for sale new from sellers on ebay. In fact I think I bight buy a couple more myself for future needs.
I and many others can't get it to play hires without it stuttering and skipping. I bought 2 for £40 quid not long ago and on 44.1khz they work perfect, anything above that and they stroke out.
I even bought the ethernet adapter for one incase it was a wifi problem and it still has hires problems. I have to limit qobuz and other apps to cd quality if I want to listen to tunes using them.
I have tried streaming from my now stolen iphone, android phone, ipad and it still wont play nice, but every other device that I use for hires tunes works perfect, example my pc with roon and qobuz on its own.
I've reset my router, flashed it twice to two new FW versions, tweaked just about every wifi setting imaginable and then normal settings except upnp and, whatever the cause is, it's alluding me. Loads of folk have the same problem and I'm at a loss to what the cause is, bad batches of cca's, different components on later models etc etc.
It's so bad that I won't use it on TT2 & HMS as when it freaks out the sample rate indicator goes from say green to red to green to red multiple times in 2 seconds, getting scared it damages hms or tt2. Locked at 44.1khz they work fine. I see you mention 192khz playback, cca's only go upto 96khz, so was it downsampling your 192khz track to 96khz or 44.1khz before it got to your dac ?
I've tried 4 different optical cables also, mini toslink type, I'm really at a loss as to whats causing it, watch this I will go enable upnp which I REALLY don't want to do and it will fix the problem.
It will be something stupid like that.
I got them from mymemory.co.uk or something like that for 20 quid, if you are looking to grab more try them, if thats not the correct name I can look up emails for you and get the correct url.