New at Qobuz - no HiRes sound

RTFM Mark Levinson 30.5 DAC page 10...

"In addition to the common 16 bit at either 44.1 and 48 kHz sampling rates used by digital sources such as CD and DAT, your No30.6 also supports the two channel 24-bit/96 kHz signal that was defined as part of the DVD-Video standard (and which will certainly be included as part of a larger DVD-Audio standard when the industry agrees to such a thing). As of the writing of this manual, such “24/96” material is just beginning to become available, and we expect availability to grow quickly over time.

In addition to true 24-bit capability, the No30.6 also incorporates High Definition Compatible Digital® decoding to take full advantage of the increased resolution available from HDCD-encoded 16-bit CDs. The High Definition Compatible Digital® format retains much of the reso- lution inherent in professional twenty bit recordings, by encoding this information more efficiently within the sixteen bit space available within the Compact Disc format."

Thank you for all your responses. Meanwhile I did more testing in trying to find a solution. Here is what I found:

If I play "Hi-Res" on Tidal, my Mark Levinson indicates a sampling rate of 48kHz on the display. Regular quality reads "44.1". So there must be a distinction between these two modes on Tidal.

I reset my node2 and re-configured it. Took me a while as this process is flawed, as far as I can tell. Anyway, I can play music from Qobuz, however some albums do not play at all (e.g. Pat Metheny, Bright size life). No matter what sampling rate I choose on Qobuz, even with "CD 44.1kHz" it does not play at all. And yes: I reset the apps to ensure that this sampling mode is on.  Other albums either show 44.1 or 48 on the Mark Levinson display. Does that mean that this record only plays on the higher resolutions?
If I use the analog output of the node2 and connect it to the pre-amp I can listen to this album. So that seems to confirm that this album (and probably others) will only play with DACs that accept such high sampling rate. I guess I am out of luck with my ML.

Any comments or suggestions?

I have a feeling your DAC has been generation gapped and cannot decode the hi Rez file formats coming from the Node. I have the exact same problem. Some HR files read while others do not. Sadly unless ML can provide a firmware update you are out of luck. I run an Emm Labs DCC2SE and I am going to replace it in the near future. The Cambridge audio DAC magic that I own decodes everything only because it is newer. This is the very big downside of digital audio. There is no future proofing. For my part the Denafrips Venus is high on my list of options as it has NOS as well as the capability to decode very high sampling rates. 

I could be wrong. But I think this is the most logical answer to your question. If you want to send a list of tracks I can try on my emm labs and if my DAC also can’t play then we will know the answer to your problem. Because the problem with mine is that it has been generation gapped. 

Yes I think you are absolutely correct. I am still testing and see if a change to Qobuz makes sense to me based on my DAC limitations. I was able to compare the same recording (Dire Straits - Brothers in Arms) played by Spotify, Tidal and Qobuz using my ML 30.5: Quality with Qobuz was best, and interestingly the ML displayed "HDCD" when playing this track. Soundstage and -depth was amazing. I guess what I am doing is using the node2's DAC for my streaming source (except where my ML is capable of converting) and use the ML solely for my CD and DAT sources. In direct comparison the ML provides the better soundstage and a tighter image than the node2 but I have to say the performance of the node2 is impressive, in particular when considering the price difference.
Your info about the Denafrips is well noted. I will perhaps upgrade my node2 for a better DAC and a better user interface. 
Thank you again for your input!

Of course my pleasure. I posted a very similar question to the forum a few weeks back and got it resolved and it is nice to pass along the info. I am quite surprised that the node analog out compares favorably to your levinson. I would say that definitely puts you in the market for a DAC upgrade. The difference between the DAC I am running and the node is very very significant. Another question I had for the forum which has not been answered is can anything on the market right now compare to an Emm labs of the older generation (without spending more than $10k). Once I get a Denafrips in the fold I suppose I will answer this question for myself. 
I read a lot of experiences on the node in the forums but the comments do not indicate whether they are running direct out of the analog or to a separate DAC. many people might be judging it solely on its analog output rather than as a transport which would be a bit limited in my opinion. So many of us have a stand alone DAC or a high end cdp that can decode. 
Lastly I have found that if you have both tidal and qobuz a good bit of music not available on one will be available on the other. But this difficulty decoding is a major issue for me as A LOT of more recently released stuff is only available hi Rez  on both platforms. 
Good luck on your quest!  For my part, a new DAC (as long as it sounds good) is the only solution.