Cannot access Xfinity Mobile Bill Information (can't view the actual bill)

This has been an ongoing issue for the last several months, maybe ever since we added our 5th line in December 2019. I can see my total bill amount, but I can't access the actual bill, which gives the amount of data used by each line on my account. Everything else about the service is great, but this little thing is super frustrating. Why can't I access my billing information online? Whether I'm on the app on my phone, or the browser on my computer, when I click the dollar amount that should take me to an itemized view of my bill (where I can see usage and charges by line) I get the message "Something went wrong." Clicking the 'Try Again' button does nothing.