I want to migrate user data from a network share to the "Personal Documents" folders of the user's My Site. Therefore I want to give an Administrator full access to the My Site of all users.
I've been able to grant an Administrator full access to a particular My Site using the SharePoint Online Administration (in the manage profiles section, https://contoso-admin.sharepoint.com/_layouts/tenantprofileadmin/ProfMngr.aspx), and this works fine. However, I'd like to give the permissions to all My Sites in one go. Is there a way?