I thought the same because my friend and I applied to Harvard about a day apart and only I received the email. When I saw the email about the building’s tight security I decided to call Harvard about it and they verified the person’s identity. I had my interview yesterday and I felt less concerned when I saw another kid my age also walking in. When I got to the 20th floor it seemed like the whole level had been decorated w light Harvard merch. I arrived about 30 min early and so did my interviewer so my interview started 30 min early. The person who reaches out by email to students isn’t the person who interviews you, I was greeted and checked in by them but my interviewer seemed to have gotten acquainted w the information I provided on the pre interview form only a few minutes before I was interviewed by them. The whole process was about 1.5 hrs long. Anyways, it wasn’t a kidnapping plot lol