Not Able to Manage Call Protect for Home Phone

When I click on "Manage Call Protect" under "Phone Features", there is always an error message that states "We're Sorry. We cannot process your request at this time. We apologize for the inconvenience. Please try again later."

This has been happening a for a long time. How do I access my call protect settings?

This is for an AT&T home phone plan (not a mobile phone).