Understood, so with the setup above, on the latest official (non-beta) firmware, it plays DSD 256 fine.
If the settings match, then possibly (likely) the compatibility of your specific DAC with Zen Stream's USB out.
A bug to report:
After playing a few tracks on Tidal, using Tidal Connect, I stop Tidal, click Home icon, and try to start a web radio.
Often, start getting this:
Doesn't matter which station, it will keep giving this message.
Fix? Shutdown menu, Restart.
Then it plays fine.
Firmware 2.29.8: