Due to an influx of spam, we have had to temporarily disable account registrations. Please write an email to accountsupport@archlinux.org, with your desired username, if you want to get access. Sorry for the inconvenience.
https://gitlab.com/OpenRGBDevelopers/OpenRGB-Wiki/-/blob/stable/User-Documentation/Frequently-Asked-Questions.md#my-razer-devices-arent-being-detected