A linked ESP account is a requirement for this feature. The Progress Report updates reflect daily Assurance runs, which are exclusive to customers with linked lists, and enables you to see the history of your list data over time.
If you would like for your unlinked list to receive free monitoring, you will need to upload it to a supported ESP and link your account.
For more technical users, we offer an API for batch and realtime email verification, and ongoing Email Assurance. Learn more about the API.