The DFR works fine with Tidal on my Android phone (although my phone won’t output MQA). It’s just Windows I have the volume issue with. Also, if I use non-exclusive mode on Tidal, the volume is OK. I guess it could be a driver issue, but Audioquest’s website say that no driver download is required and there are no drivers available to download.
I also had a DFB and it did the same thing (I returned the DFB as the DFR is far superior in my opinoin).
It’s a little disappointing, since I like everything else about this device. No MQA for me I guess.