I read the spec sheet for your DAC and found something interesting: it has not any LED indication of the stream type.
So, how do you know if it is unfolding MQA?
Can you confirm?
If that’s the case, there is no way to know if MQA is actually unfolding or not, but I would assume in your case it is but Volumio is not reporting MQA logo (we never do it, for several reasons).
BTW, you see this resolution because MQA is a lossy format, and therefore it is streamed at a lower resolution.
How do you know when you stream via PC that MQA is working?
EDIT: I found out that it has a LED, and should become magenta when MQA is detected.
Now, let’s find out if this DAC has MQA unfolding or if it requires first stage unfolding, if the latter is true, it won’t play MQA on Volumio since we don’t do MQA first stage unfolding because: 1) proprietary MQA technology cannot be used in open source code. 2) We would have to pay MQA a fee.