This is what I know. The enrollment process doesn't seem to work in any build so far. When I say it doesn't work, it goes through the process of adding the phone (and I can see it on the admin page and shows compliant) but none of the Office apps (Outlook, Word, Excel, OneDrive) will see it as being enrolled. I even get to a point that it asks me to enroll and to find an app in the store to do it. But it's supposed to be built in!
How I got it to work is that I added my account to the exceptions group on the Office 365 admin page, so enrollment was not required. Then I went to All Setting, Accounts, Your Account, Other accounts you use, Workplace or school account. Add your details there. Then, when you add your email account to Outlook, the details should already be there. You just have to select it.
Let me know how you get on.