Office 365 Hybrid Tenant to Office 365 Hybrid Tenant Migration with active directory Inter-forest migration

Hi,

We have scenario where we need to do Office 365 Hybrid Tenant to Office 365 Hybrid Tenant Migration along with active directory Inter-forest migration

Contoso has been acquired by fabrikam.com. we have 2 Forest contoso.com and fabrikam.com, both the forest has Office 365 Tenant in Hybrid mode. There is very few mailboxes in Contoso hybrid environment.

Now Contoso.com forest active directory and  Office 365 Tenant workload (Exchange, Skype, OneDrive, SharePoint, Team, Planner, Yammer)  need to migrate fabrikam.com forest and Office 365 Tenant. Contoso has on premise share point farm which also need to move fabrikam.com. We are proposing quest migration manager for active directory and On demand migration for Office 365 Tenant workload migration. we need following information to build flow for migration.

1. Is on demand migration support Hybrid environment for Office 365 Tenant to tenant migration
2. Is on demand migration support for skype and teams and SharePoint online co-existence
3. Is on demand migration support for teams, SharePoint online, planner and yammer migration
4. Is on demand migration support for address re-write feature
5. Is on demand migration support for address office 365 domain move
6. How migration manager for active directory will help for clear immutable ID for Groups
7. Shall we go with single phase migration for active directory and Office 365 Tenant migration or Phase 1 active directory migration and phase 2 for Office 365 Tenant migration

We have following flow with our best knowledge on quest tools. Please help understand how quest migration manager for active directory and On demand migration for Office 365 or any other quest tool  will help for optimize flow and seamless end user experience.  

1. Create Two Way Trust between contoso.com and fabrikam.com forest
2. Deploy fabrikam.com domain controller at Contoso sites as per design
3. Create OU Structure as per design
4. Migrate Group Policies from contoso.com and fabrikam.com
5. Deploy Migration Manager for Active Directory
6. Enable password sync on Azure AD Connect
7. Update users attribute (Employee-ID) for source anchor in contoso.com
8. Disable Azure AD Connect sync
9. Convert contoso.com domain from federated to Mange domain
10. Clear immutable ID on Office 365 users
11. Convert contoso.com domain from Mange domain to federated domain
12. Enable Azure AD Connect Sync
13. Setup Directory Sync from contoso.com and fabrikam.com with two way password sync in QMMAD
14. Migrate Users and Groups from Contoso.com to fabrikam.com forest
15. Migrate application permission like SharePoint On-premise
16. Migrate Computer Account
17. Sync contoso.com migrated users to fabrikam Office 365 Tenant using azure ad connect
18. Setup Co-existence for Exchange Online and Skype
19. Migrate Mailbox from contoso to fabrikam Office 365 tenant
20. Migrate Skype for Business users
21. Migrate Teams users
22. Update outlook profile using CPUU for migrated mailbox
23. Migrate One Driver contoso to fabrikam Office 365 tenant
24. Migrate SharePoint online data from contoso to fabrikam Office 365 tenant

Regards,

Nitin