Unable to join XFSETUP Wi-Fi after Xfinity Communities installation

My apartment provides Xfinity Internet as part of the apartment community. The gateway was recently installed by Xfinity technicians.

I received an email saying "Your Xfinity services are ready."

However, I cannot connect to the default Wi-Fi printed on the gateway. My iPhone says "Unable to Join Network."

The gateway has a solid white light.

Also, when I sign in to the Xfinity app using the email I received the email, it says "Access not Authorized." If I try to recover my account, it says "This information doesn't match our records."