I have a “MSI MPG B550 GAMING CARBON WIFI” motherboard that worked without issues using the MSI Mystic Lighting. I decided to give SignalRGB a try and after removing all the MSI software SignalRGB will not set the lighting; all MB lighting and devices connected to the JCORSAIR, JRAINBOW1 and JRAINBOW2 headers are not working even though it detected these devices and components. I have tried setting the Lighting Mode to FORCED but that doesn’t work either.
Do you have any error on the console?