Accessing billing statements of previous address

I recently moved, and I deactivated the Xfinity service at my old address. I need to access my billing statements for that address.  My old account and my current account (for my new address) are linked, and they appear as such on the Xfinity website and in the app.  However, I cannot switch between these accounts like this article says I should be able to: https://www.xfinity.com/support/articles/switching-between-multiple-accounts.

How can I access the billing statements for my previous address?