When i go onto mod menu no matter what i do the configs for Illuminations dont show up. Can this be looked at and fixed?

Yeah, Same here.

Same for me

1.18.2 same problem

Modmenu compat has been removed in the latest versions as, for as far as I know, RAT is trying to switch to another way of configuring illuminations.
For older versions you might want to try installing cloth config manually as there have been versions without this dependency being integrated into the mod properly.