This blog article outlines what to do if you receive the following error message while saving documents to SharePoint.
DocumentsCorePack failed to generate the document
ERROR:|CHECKLICENSE|SUCCEEDED|new AutoMerge|StartMerge|ErrorMessage:No part of the path
Basics:License-checks are done each time the application is accessed by a user.
Having an invalid license stops the whole product from working.
An invalid license will never have any impact on Dynamics 365, it only limits the addon itself.