F5 APM office 365, outlook SSO working but not share point

Hello,

Our college domain is sierracollege.edu and we federated sierracollege.edu. After login to portal if I click Outlook the SSO is working as expected.

Our sharepoint site is sccd.sharepoint.com. From portal if I click webtop link for sharepoint, first it asks for email, after entering email it will take me to sharepoint site.

Here is my question, if user clicks sharepoint webtop then how can it provide the same experience like outlook. I mean do not ask for email address again.

Thanks in advance.

Saty