I've been going down the Hi-Res audio rabbit hole and learned how to buy from ototoy.jp (RIP my wallet). I ran across this comment for MacOS which was immediately applicable:

"The primary issue many don't realise is how Mac's are configured to play anything other than the standard 44.1khz/16bit output. To make this work, you must configure the output stream using the "Audio MIDI Setup" application found in the Utilities folder (from the Window menu, select 'Show Audio Devices', pick the output and set the Format to your choice of output). The maximum frequency is entirely based on the hardware capabilities. My 12 year old Mac Mini is quite capable of outputing from iTunes at 96khz at 24bit through the headphone out (which doubles as a digital toslink output) to my Pioneer receiver that can process the toslink input at 96khz/24bit. Has worked just fine for this purpose for years (and yes I've verified that the Pioneer is indeed processing 96khz/24bit data). Newer Macs can natively handle 192khz, though the toslink out via headphone jack was depreciated in more recent years, likely because few knew it existed."