Why can't I see the keys in the Property mappings? December 29, 2016 23:40 The key symbol allows you to define key properties when you are copying content between lists. If you are copying libraries, you will not see the key symbols, as the property keys cannot be modified. Related articles Why didn't Sharegate migrate my groups/permission levels? Set Property Mapping Are list item IDs preserved during migration? Incremental Copy does not match the destination item Why does my SharePoint 2013 workflow fail to start after migrating it? Comments 0 comments Article is closed for comments.