This was my first time attempting this. I made a mistake. Do the same process but WAIT until the COZ and Daily Challenge are the same (they will be the same in the next hour...2nd game world hour if I remember correctly). Then that Daily Challenge will repeat several times throughout the day, so keep your wisdom medals to repeat this process!!! Lots of EASY DIAMONDS!!
PS: Everyone was sleeping so I either didn't talk, or spoke softly.