RX 5700XT Taichi X not detected by polychrome

https://pg.asrock.com/Graphics-Card/Intel/Intel%20Arc%20A770%20Phantom%20Gaming%2016GB%20OC/index.asp#FAQ

Honestly this happens way more often than people think with Polychrome and certain GPUs. A lot of graphics cards use their own separate RGB controller software, so even if the motherboard RGB sync works perfectly, the GPU sometimes just refuses to appear in Polychrome at all.

I would first check if your GPU brand has its own RGB software because sometimes installing both causes conflicts too. Also try completely uninstalling all RGB apps, rebooting, and then installing only the latest Polychrome version fresh. I have seen that randomly fix detection issues before.

If it still does not show up, there is a good chance the card simply is not fully compatible with Polychrome control. You could check https://etechdevices.com/ for RGB accessories and GPU support gear, and communities like RGB Sync Hub usually have a lot of people discussing weird Polychrome compatibility problems with graphics cards.