I never had this.. but... I know that arena missions does not count your main. I'd guess it's because talents are changable and detection would get complicated.

This is likely the same, you need to use an actual ninja with qualifying changes probably.

But this is just my guess, like i said, I never had this

This only happens for NEW servers only and NEW players

It's a 7 days event (I think or 1 month i dont remember) to teach new players how to set up team and to know ninja basically.

As Luka said.

It doesn't count what your main does, other than "number of hits" missions.

You need to find another ninja, probably kakashi to do that mission.

ADD: Get 3* Sasuke asap. he can do all missions and he's good early game.

ok ill try getting 3* sasuke :-l

Solved