Forum Discussion
Office 365 Single Sign On
What you are looking for is the "seamless SSO" experience, which is certainly possible with AD FS but requires some additional configuration. First of all, make sure to review this article to better understand the expected experience: https://blogs.technet.microsoft.com/abizerh/2013/04/11/more-information-about-sso-experience-when-authenticating-via-adfs/
Once you cover that part, start working on the real solution for seamless SSO - smart links. I've put some guidance here: http://www.enowsoftware.com/solutions-engine/using-smart-links-to-improve-the-login-process-to-office-365-applications
For SPO in particular, you can also take a look at the "acceleration" feature: https://support.office.com/en-us/article/enable-or-disable-auto-acceleration-for-your-sharepoint-online-tenancy-74985ebf-39e1-4c59-a74a-dcdfd678ef83?ui=en-US&rs=en-US&ad=US
but why get into more complex configurations when they have it almost there with AADConnect and ADFS?
Perfect thanks both Vasil and Pablo for all the information provided . I shall review this with my Team and reach out for any additional questions.
