Forum Discussion

Copper Contributor

Oct 10, 2018

Outlook 2016 - Promping for windows credentials and O365 license reg. even with SSO.

Hello, When we start Outlook 2016 - Office 365 for the first time, it's prompting for Windows credentials and after that it promts for Office 365 login to register the Office license. BUT, we...

office 365

wroot

Silver Contributor

Oct 10, 2018

Also, by implementing SSO do you mean only enabling this setting in AD Connect (and probably adding URLs to intranet)? If your tenant is older than 2017.08.01, you also have to enable Modern authentication for Exchange Online (and also for Skype for Business as it is recommended to enable both):

https://support.office.com/en-us/article/enable-or-disable-modern-authentication-in-exchange-online-58018196-f918-49cd-8238-56f57f38d662

https://social.technet.microsoft.com/wiki/contents/articles/34339.skype-for-business-online-enable-your-tenant-for-modern-authentication.aspx

Lennart Ingemann Nielsen

Copper Contributor

Oct 10, 2018

Thanks for your input.
Sorry I missed the info, we're running latest version of Exchange 2016, not Exchange Online yet.

wroot
Silver Contributor
Oct 10, 2018
Then maybe you have to do Hybrid Modern Authentication for Exchange On-Premises https://blogs.technet.microsoft.com/exchange/2017/12/06/announcing-hybrid-modern-authentication-for-exchange-on-premises/
There is a list of requirements for it. Haven't done this myself, we use Exchange Online.