I have a SharePoint site which was part of a Microsoft Team. The Team has been deleted, however I cannot delete the SharePoint as in the site assets section there is a notebook file which is of the notebook type - "staff_edu". I cannot delete the site due to this file. There are no labels and retention policy set which is stopping the deleting of the file or the site. I am able to delete everything else in the site, the site is no completely empty other than the contents of sites assets. How can I delete this file and the SharePoint site.