This works nicely, when a user starts their Chromebook they are prompted with an Office 365 login dialog. When they logon and go to portal.office.com everything is SSO, no need to enter credentials.
However, when they then open let's say Excel 365 Android app, it's asking for an email address and wants to sign-in again so there is no SSO. When I authenticate one time to Excel some other Office 365 pick up the credentials and work as well but not all (like Word, Powerpoint works but Teams, Skype don't).
I think this is because play store apps use the G Suite / Google Apps account which is synced from Azure rather then the Office 365 one.
So the question is how can I fix this, enable full SSO to Chromebook Android Office 365 apps? Maybe even pre-configuring apps like Outlook, Teams etc. There is no on-premise domain, it's Azure AD only for now.