Did you do the damage after the CB was already killed? That might not register if you used the key after CB was killed

just a guess, not completely sure how the quests calculate, but I do know you can hit CB after its been killed and I like the option to do so as when I get home from work the CB is usually killed  in my clan but I can still hit it and get a score for the CB rewards

Perhaps you used one of your keys already before you got the mission so it didn't count? Otherwise, not sure... 

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Okay so I just used my first key of today on unm, and as you can see from the included SS it is counting toward this mission. The mission clearly says nightmare though.

So either this quest is bugged or the text is incorrect.

You have to do all the damage on the same day but that isnt the issue here of course.

It is really wierd, it all worked ok for me- but i bought keys and got all the clan boss quests done before the clan boss was dead to be safe, have you got the quests done now?

yes its done, unm damage went towards the quest, where last night my damage on nm did not progress it.  Makes no sense but idc as I would have used keys on unm today anywas.

It only counts damage done after the mission is active, so if you used two keys, got the mission, and did a third key for 14.1M, it'll only count the last key towards the mission, not all your damage from that day. It seems silly for it to be this way, since clearly the mission can track daily resets, but oh well.

Of course it only tracks damage after you have the quest. That is not what happened here.