Forgive me if this is old hat to you all, but I came across a problem with getting MQA from my Tidal HiFi account. I had the right account type and I was listening to Masters but there was no blue MQA light. After much faffing about checking connections and settings for my Explorer2 I discovered that, on my computer, I had not given Tidal exclusive use of my Meridian USB DAC (as the Explorer is designated: the DAC was set as the audio output for Tidal, but not exclusively). Once set correctly all was fine. This may be a peculiarity with my Lenovo computer and its Lenovo HD Audio manager but I thought I should share it.
Cinema: 861v8, ID40, HD621, 800v4, DSP5200SE(2+C), DSP3300(4), DSW, + various recorders and streamers.
TV+Music: MS200(x2), Explorer2, QNAP, DSP33(2), 104 Tuner
Music: All Quad incl ESL63 + Gradient Subs(2).
Spare: 101, M2(2), 207