The list you identified was tagged as inactive in December. We had sent instructions, https://emails.illinois.edu/newsletter/900032060.html
, in November announcing the mail list server migration and describing how to make sure your list was not tagged as inactive. We anticipated many list owners did not take action so we've archived all the data related to the inactive lists. We have a process to manually recover the data and reestablish the list on the new server which will be online early to mid-week next week, 1/10/2022.