I've tried using a couple variations of =COUNTIFS(Schedule!B:D,B4,Schedule!A:C,"<>")
But I don't understand well enough how the formula works, in general.

I thought:
=COUNTIFS(Schedule!B:D,B4,Schedule!A:C,">")
But that didn't work. I get 0, it should be 2.

Then I thought:
=COUNTIF(Schedule!B:D,B4)>=COUNTIFS(Schedule!B3:D308,B4,Schedule!C3:E308,"<>")
But that gives me: TRUE
Then I put the COUNTIF formula on the end, after the COUNTIFS formula.

Am I even on the right track?

(BTW I changed columns around. Column A became C and C became E)