I also got a graduate certificate through Harvard Extension School a few years ago, so it's possible that I am in the system in an odd way through that!
It is very likely a fluke that I was able to access the admitted students website BUT while I am here I am looking around and there are a lot of virtual events starting March 22, so they gotta tell us before then!
I entered login info but I just clicked the website link in your post! I am temporarily locked out of my financial aid account because I messed up my password too many times...whoops...