Provisioning user accounts using Azure AD Connect in a Tenant to Tenant Migration

Question

I'm faced with an Office 365 tenant to tenant migration involving 2 tenants. Tenant B will be migrating into tenant A.
Both companies have a separate azure ad connect environment, synchronizing their accounts to their own tenant. Both companies have different upn's: companyA.com, companyB.com.
Now I will need to create new identities for users living in active directory of company B in tenant A.
My plan is to create another sync on the company A azure ad connect server, to synchronize the accounts from the company B active directory to tenant A at the same time.
Of course they will be created with a @companyA.onmicrosoft.com upn.
At the end, when all data is migrated, the domain @companyb.com will be deleted from tenant B, and registered in tenant A, and then the upn is changed from @companyA.onmicrosoft.com to @companyb.com.
Would that be a supported scenario? Best regards
Peter

Answer 1

• Hello @Peter B
• Thank you for posting this concern on this community.
• I just wanted to gather the next article which shows supported scenarios, and it might be helpful for you to do your decision making about it. https://learn.microsoft.com/en-us/azure/active-directory/hybrid/plan-connect-topologies
• Looking forward to hearing from you
• Cheers,
• Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

Answer 2

https://learn.microsoft.com/en-us/azure/active-directory/hybrid/plan-connect-topologies#sync-ad-objects-to-multiple-azure-ad-tenants One object can be synced to more than one AAD tenant, but you need to not have attribute writeback for those objects from more than one tenant. I.e.: You can do Exchange Hybrid from one tenant to any given user.

Answer 3

Hi risolis
Thanks for answering. I know these supported scenarios, but it doesn't really cover my needs.
What I would like to know is, if the following configuration is supported.
On the left you can see the current configuration.
The right side should be the final configuration, where the domain companyB.com is now part of tenant companyA.com.

Answer 4

Thanks to both of you.
Of course my scenario is covered by your link. Not sure where my head was, as I wrote my question, was a long day.
Regards
Peter