Make O365 user identity available in Word Add In
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.

Single sign in is now in product/GA! Thanks for your suggestion. Let us know if you encounter any issues by going to https://github.com/OfficeDev/office-js/issues and opening a new issue. Thanks, Microsoft 365 developer platform team.
4 comments
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Gaël commented
Hello Office Extensibility Team,
I see this feature is still in preview and you discourage to use it in production. Do you have any release date please?
Thanks!
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Tom commented
Hi Office Extensibility Team,
Are there any updated on when this might be moving out of a preview phase? This announcement was made in June 26, 2018.
I have reviewed all the documents but found no roadmap that indicates it. -
Martin Seifert commented
Agree 100%
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Jim Lim commented
We would like to remove the confusion of Microsoft (Personal) Accounts vs. Office 365 (Work/School) Accounts when a user signs-up to our service via Office Task Pane Add-in.
We think we can do this by only presenting the relevant Microsoft account to sign-up to our service, by first detecting what type of account they have used to sign-in to Office.
Since we are using Azure AD and AD B2C (Preview), we also need to know in advance which AD to use, since AD B2C doesn't support Office 365 (Work/School) accounts.
For example;
If I am signed in to Office with a Personal account, I want the default signup to read "Continue as John Smith (Personal account, created by you)." which then utilizes Azure AD B2C.
If I am signed in with a Work/School account, it should read "Continue as John Smith (Work or school account, created by your IT department)." which then utilizes Azure AD.
Of course, we would still have to present an option to choose another type of account, just in case we get it wrong, or if the user prefers to sign up using Google or Facebook, as an example.