I was wondering the SAME thing. I've never used it, but it keeps saying invalid or expired code when I try.

Kinda sucks to miss out when I've never used it.
Currently using:

Poo: CON Sulfate Free poo
Rinse out: Tresemme Naturals
Leave-in: CJAOO Daily Cond
Styler: KCCC sparingly and Ampro Olive Oil Gel where needed
DT: KBB Lucious Locks Mask + EVOO/Avocado