Looking for a formula that can tell me the amount of work completed per employee

Hi! I'm attempted to find a formula that can tell me the number of tasks completed per a specific employee or "navigator."

I've attached screenshots of what I've tried, and I'm struggling to understand why this won't work. The formula I am trying to use is:

=COUNTIFS([Navigator Name]:[Navigator Name], "Jacob Schmaltz", [TransOutcome1]:[TransOutcome20], "Completed")

Here I am trying to see the number of Transition Calls Jacob Schmaltz has completed... but I'm told this is an incorrect argument set.. does anyone have suggestions?