Sallie Mae Manager, Project Management interview questions

3 interviews - one with HR, One with hiring manager, final interview with team members. First two interviews were okay. The final interview was a flop. One member didn't show up, so they substituted somone else at the last minute, but couldn't stick around for the entire interview. They primarilty focused on my PMP accomplishment and never discussed the role or what a PM would be doing if hired. I then received the dreaded rejection letter from HR. I asked HR if they were able to provide some feedback on what I can improve upon for an interview for future reference, I was then ghosted.