Razer Core X Chroma and AMD Radeon RX 5700 XT Sadness

Was very excited to try out an eGPU solution using a brand new Razer Core X Chroma and Radeon RX 5700 XT on my 2018 MacBook Pro running Catalina 10.15.1. I selected these because of https://support.apple.com/en-us/HT208544, but no go.

Anyone out there having a similar issue? The Macbook sees the Core X Chroma on the Thunderbolt bus, but does not see the 5700 card. The card is seated in the chassis and the 6+2 power cables are plugged into the card through the 5700's included adapter. When I plug in the thunderbolt cable, everything lights up, fans spin, the card's fan is activated, 'Radeon' lights up, but the Mac doesn't see the card when I view the Graphics/Displays section in the System Information report, and it doesn't recognize an external monitor attached through the card. It sees only the Core X.

I've reseated everything twice in the Core X and have no luck. Anything I'm missing?