I did some intensive testing of playback of Qobuz files when I first purchased Audirvana, Perhaps 2 years ago. I downloaded the same track from Qobuz and from HDtracks, and also streamed it from Tidal and from Qobuz. The downloaded versions were bit-perfect identical. In playback, however, the streamed version from Qobuz didn’t even sound as good as the streamed version from Tidal, even though the Qobuz version was 24/96 vs. Tidal’s 16/44.1. The stereo soundstage with Qobuz streaming is significantly degraded. Audirvana left and right showed 24/96 playback, yet it didn’t sound nearly as good as the downloaded file.
It took me the better part of a year to get Sebastien (the newsletter guy) at Qobuz to admit that they limit the bandwidth of streamed content. He didn’t specify how but my guess is that they combine the two stereo channels into sum and difference streams and compress the difference stream. That would allow them to cut the bandwidth of streamed content, nearly by half. The result in critical listening is a compressed soundstage.
Sorry, I know that this has little to do with your problem, but the point is that even when reported otherwise, streamed content from Qobuz had deliberately reduced bandwidth. Also, you may need to be persistent when it comes to tech support from Qobuz.
Regarding your particular problem, are you sure you aren’t selecting your test file from under the Qobuz heading, below your library? Once you download the file, the original source becomes irrelevant. You should be able to disconnect your computer from the internet and still listen to your file. In fact, why don’t you try turning off Qobuz playback in Audirvana to test this. Go into your settings and uncheck Qobuz. That shouldn’t affect playback of the track if you’re playing it from your Audirvana library on your NAS, but if you’re playing the track by streaming it from the Qobuz server, you’ll be blocked.