Dear Community.
I want to do some brainstorming and get your Ideas.
I have an AD Forest as in the following picture

- Tree Root (Forest) connected to Azure Cloud Tenant and all users and devices from the Trees.
- demoorg.local and subdomains synced to the Azure Cloud Tenant.
- Users from xy.demoorg.local & xz.demoorg.local is using the same upn (domain name to log in to E-Mail, Teams.
- All devices are Hybrid joined. (Conditional Access is not in use)
- Pass Hash Authentication is activated.
- E-Mail server is Exchange but the on-prem and e-mail server uses only users from xy.demoorg.local & xz.demoorg.local
- There is no Cloud app or other cloud resources using the xy.demoorg.local & xz.demoorg.local
- All Devices from xy.demoorg.local & xz.demoorg.local managed from local GPO.
- All users use only a password and username for a Windows Sign-In (There is no Windows Hello or Pin or Security Key in use)
Task:
- I want to create a new Azure Tenant (only one tenant) and connect all users and devices from my xy.demoorg.local & xz.demoorg.local (demoorg.local tree) to the new Tenant and disconnect the tree from the Tenant which is already connected now.
- As I know first I need to delete all synced devices and unregister my domain name (used for Teams and Outlook Sign-in) from the old tenant and register my domain in the new Tenant.
- Then I want to sync all devices and users to the new Tenant.
Question:
- Is It possible?
- If yes, which scenarios are available there, and which scenario do you prefer?
- If there will be downtime during the migration?
- Which other questions should I answer?
- Or maybe I should separate my own tree from the forest and then connect it to the new Tenant