Within my SharePoint 2010 environment, I have created my own Managed Metadata Service including a specific term hierarchy. After doing so, I wanted to use these terms as a managed metadata column in a custom list. I was able to create new list items leaving the newly created metadata field empty. But, as soon as I started typing in the metadata field, the system prompted me with appropriate synonyms of the matching terms. However, when I tried to save the new item, I got an error message saying “Access Denied”.