I'm having this same problem. One day I updated to the latest armory crate (due to auto updates) and the aura lights built into the z390-E mobo all turned off and won't turn back on. I've tried uninstalling the armory crate and the aura service, but ...
I just updated the armory crate to 2.6.4.0 and my motherboards aura lights turned off and even trying to turn them back on in the bios doesn't do anything. The armory crate things my motherboard doesn't have aura either. Its an ROG STRIX Z390-E GAMIN...