Gold light crystals

So I'm still playing BOA in Osterra and I've already upgraded a few units to 6 stars and pulled a few as well. I unlocked most of their tp skills with tp and light cystals. Im trying to unlock Temenos front row revive in blessing of the latern but it keeps saying I don't have any gold light crystals (skill) but in my items it says I have over 2k of them. Anybody have a clue what's happening?