I appreciate this feature is still in beta and there are a huge number of DACs to try to deliver support for.
Can I ask that the Qudelix 5K be looked into: https://www.qudelix.com/blogs/5k-dac-amp
Currently the DAC is recognised and ARC is able to take control of it:
But playback results in this:
The DAC is working correctly using UAPP, this is not to draw comparisons just to show that everything in path is working as it should: