I have an on-prem AD called local.aa.com & an Azure O365 users aa.com, not synced.
we are merging with different organizations, ab.com, ac.com, ad.com, they all have on-prem AD and O365 users.
We need to federate or create a trust so all the AD users can share Teams, Outlook Calendar & Sharepoints.
Whats the best option for this scenarios.