Normally, an API-key gives the user of the Word add-on access to all the document templates in the application. It is possible to specify which templates are available per API-Key, to manage this go to the API-key menu.
This API-key has access to all document templates, to change this set the setting ‘Rights to all templates’ to No an select the templates.
After saving, the user of this API-key will only see the Incoive_Advancedmerge template in his/her Word add-on.