You need to play Michelles content and you can put in the additinal codes.
On that note, my save got broken some updates ago, so I played from beginning again. So I put in "DressUp" really early and customized for good 1 hour. While playing I sometimes got then the message "character unlocked for customization" and it would do a reset of that character.
And while playing certain parts (don't know which) you have no access at all for one character, e.g. Lisa Ann. Afterwards it would get unlocked and reseted.
That's some annoying feature.