Finishing Black Tusk Invasion

Finished the main mission with a friend, and now I’m playing solo. Just enjoying the game play, and not overly concerned with farming and building up. Currently trying to finish up the various projects. The first item on the Black Tusk project is to replay the George Washington hotel mission. I have completed it twice after finishing all the main missions, but it still shows as incomplete in the Black Tusk project listing. What am I missing or doing wrong? Thanks.