I have an interesting scenario. From what I have read it's not possible but I wanted to see if anyone has a workaround. I am an educational institution. We have a two separate Staff and Student networks that include AD services. We Share One O365 tenant but have a student (email@example.com) domain and a staff (firstname.lastname@example.org) domain . We currently use AD Sync for staff accounts. Is it possible to add ADSync in my student AD and sync to the tenant but only syncing to the student accounts? Currently our Staff ADSync only syncs staff accounts (email@example.com). Reason is I'm trying to improve login process and experience and have some legacy applications that students need to access via RDS Remote Apps. I could spin up an RDS server in Azure but we are a school and it would be costly to do so.