TIAA Administrative Assistant interview questions

Once I got past the initial phone interview I was called in for a 2 hour interview. I learned about the company and met with other admins there. A few days later I received an email saying I made it through to the next round. I filled out all the information for the background check and everything was going good until everyone I was in contact with ghosted me. HR was saying they were waiting for that particular office to schedule a second interview. I kept emailing and calling for a month and after a while they just stopped answering. Never had that happen before. I still don't know what happened to this day.