Forum Discussion

Copper Contributor

Sep 12, 2018

Solved

Outlook and SSO

I have an O365 tennant with Azure AD being the only directory source. If I join a machine to Azure AD, thus requiring the Azure AD sign-on to be used for login, should Outlook be able to sign-in aut...

Victor_Ungureanu
Sep 13, 2018
Do you have Modern Authentication enabled for Exchange Online?

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

Dave Durand

Copper Contributor

Oct 05, 2018

For the record, modern authentication was set to 'false' for this tenant, thus the issue I encountered. As soon as I enabled, it worked as expected.

wroot

Silver Contributor

Oct 06, 2018

You should also enable it for Skype for Business, if you haven't already. It is even recommended to have it enabled both for Exchange and Skype. https://social.technet.microsoft.com/wiki/contents/articles/34339.skype-for-business-online-enable-your-tenant-for-modern-authentication.aspx

As it says in the article, Modern Auth is enabled by default for new tenants since 2017 August 1. So i guess your tenant is older (like mine was). As we are using local AD, i also had to add SIP address for a user into ProxyAddresses attribute for Skype to find correct username automatically, but in your case this is probably not needed.