When making a Local Object Model (OM) connection and choosing WAP as the target type, the following error is displayed:

User is connecting to a WAP that is using Claims Authentication (on SharePoint 2013, generally), and choosing to connect as a different user. It is assumed that the different user has full access to the Local Object Model.
There is an issue when passing through a different account to the SharePoint Object Model when the WAP is using Claims Authentication. This may occur in SharePoint 2013 or 2010.