After I earned the 200 reputation points in a day, I should get the "Mortarboard" badge, but I didn't.
Does anybody knows, why?
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The association bonus isn't considered for the MortarBoard badge. Details here.
Your reputation without the association bonus for yesterday is 138.
100 of your 238 reputation came from the association bonus. This rep does not count toward Mortarboard, Epic and Legendary.