We are building an extranet in a dedicated on-premise environment. We want documents to default to opening in the native application. Opening in the web app is not considered an acceptable user experience.
External users are asked to enter credentials in the native application, but the document never opens. External users log in to the SharePoint site collection with credentials from our AD.
Current hypothesis is that SharePoint is providing credentials from our AD, while the user's office application is expecting their internal credentials.
Is there a solution for this?