Authenticated O365 users shall not be prompted to login again when they want to use Word Add-In. At the moment any Word Add In secured using O365 directory need to prompt users to enter their credential again despite that they have logged in to O365.
The goal is to provide a better user experience with this single sign on.85 votes
We’re happy to announce that single sign-on is now in preview. You can find more information here:
Office Extensibility Team
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