“Harris had to step in to break the tie and get him approved.”
Not true. He was approved by the Senate on April 27, 2021 by a 49-45 roll call vote. Below is a link to the official U.S. Senate vote. Harris did not cast a vote since there was no need to brake a tie.
On April 27, 2021, Kahl was confirmed by a vote of 49–45, with many GOP Senators absent.[1] He was sworn in the following day by Secretary of Defense Lloyd Austin.[27]