Pixel 2 blue tooth was not working when I got my Lumi back in January. Was running V 1.0.4 from the Play Store (Lumi Music (early access)) . The phone could "see" the Lumi as a connection option, but not connect. It would begin the connection and immediately drop it. I was too busy to pursue a fix, so I set it aside till this week (3/30/20). Emailed support. They asked me to try the newer version, V 1.1. So I uninstalled V 1.04 and downloaded the "newer" version from the Play Store. The app worked! Odd thing is, it is still the same V 1.0.4.
So support thinks there's a newer V 1.1 Lumi Music app out there for the Pixel, but I could not find it, but the old version worked for me.