"Access not Authorized" on app and unable to sign in on website

Signed up for internet service for a new apartment and made a new account. Was able to select a plan and set up an appointment time, but then tried to sign in to my account to set stuff up and move my appointment time and I cannot sign into the account. On the app, I sign into my account, but I keep hitting a page that says "Access not Authorized". When I try to sign in on the website, I click sign in, but it just goes into a weird loop of signing me out again and I cannot access any account information. See below for the access not authorized error. I do have a previous Xfinity account that is linked to my parent's address so I did not want to move their service so I signed up for a new account for a new place and something about that seems to be messing up this process. I did see something on the forum about linking these accounts, but I kept getting a timeout error when I tried to link the two accounts, so I'm stuck.