When trying to delete a subscriber group, click on the green check mark to confirm and it goes to a 404 error page.
1. Under subscribers, click edit group. 2. Click Red Delete group button. 3. Click ok for "Are you sure you want to do this? This is a non-reversible action" pop-up. 4. 404 error screen appears and the group is not deleted.
I am having the same issue.
I am still having this issue
Are these groups by any chance groups that were attached to an archived Campaign?