Hi Kristin, This issue has now been resolved. Would request you to kindly check and let us know in case of any queries. You can also check the status of these applications on status.adobe.com . This lists down the availability(if there are any scheduled maintenance activities going on) of all applications on the Marketing Cloud and their current status. ThanksNikhil

Hi Kristin,Apologies for the inconvenience caused.Kindly go through the 4.x Migration Guide and see if you have followed all the steps correctly.Thanks!