Goal
Enable users to login to Office 365 using their Active Directory username and password.
Details
AD: One local domain (2012 R2) and one trusted (2003).
AD Connect: synchronises users from both domains but passwords are only synced from the local domain.
I've checked that in the trusted domain users are created as iNetOrgPerson not User type like in the local domain.
Is there a way to troubleshoot this somehow?