Here is a thread with a screenshot of what it should say when you hover over your CP XP bar if you are enlightened..
http://forums.elderscrollsonline.com/en/discussion/161769/enlightenment-does-it-work-i-have-not-received-anything-yet/p1
Notice, it stills says XXXX/400 000 XP.. but it states they are enlightened.
I don't believe the champion bar ever changes from 400k xp.. it just adds in the multiplied xp to that bar. When you are hovered over that bar, does it say something like "You are enlightened"? As well, when you log into the VR character, "You are enlightened" should briefly pop up.
If not.. contact customer support.
BillyMailman wrote: »If you want to be certain, type the following line into chat exactly; your current Enlightenment amount will be displayed in chat:
/script d(GetEnlightenedPool())