ZM2 Blueprint

Hello,

I wanted to exchange ZCoins for a weapon in a blueprint, it says to clear Zombie mode 2 maps once a day, I thought it means only 1 map, so I cleared one on easy and it didn't work, then cleared all other 2 maps on easy too and still didn't work, I'm doing something wrong? Does it need to be on normal or hard? And if yes, clear all maps again or only 1 map?