Hi everybody, I have the following situation: Single Active Directory domain (domain.local) 2 Office 365 tenants (domain1.com, domain2.com) 2 ADFS Servers one of them syncing users from one OU1 to domain1.com and handling SSO. Users have UPN Suffix domain1.com in active directory the other one syncing users from OU2 to domain2.com and handling SSO. Users have UPN Suffix domain2.com in active directory Now the problem is that we have users in each domain which are having mailboxes on both tenants. Currently these users have 2 active directory users. I would like to change this, so the people just need 1 active directory user. Is there any way to accomplish this? I appreciate any input, have been fiddling around with this but can not find a solution on this problem. Thanks everybody in advance for your time! BR Chris

Hi @Christoph Nellis Thank you for your post! I understand that you are looking for a way to have a single Active Directory user for users who have mailboxes on both of their Office 365 tenants. You can migrate mailboxes from one Microsoft 365 or Office 365 organization to another If you want collaboration and access to applications across different tenants, while maintaining the organization’s ability to evolve and manage user lifecycles efficiently you can use Cross-tenant synchronization This feature is particularly useful for organizations that own multiple Microsoft Entra tenants and wish to streamline intra-organization cross-tenant application access. Also, you can use Microsoft Entra B2B collaboration which allow organizations to securely share their applications and services with external partners and guests. Reference: https://answers.microsoft.com/en-us/msoffice/forum/all/merge-multiple-o365-tenants/48a2cafe-50b3-4234-af2f-133df2b5a8fe Hope this helps. Do let us know if you any further queries. Thanks, Akhilesh. If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Single Sign On to different O365 tenants

Accepted answer

Akhilesh Vallamkonda 10,325 Reputation points Microsoft Vendor

2024-06-07T07:48:13.69+00:00

Hi @Christoph Nellis

Thank you for your post!

I understand that you are looking for a way to have a single Active Directory user for users who have mailboxes on both of their Office 365 tenants.

You can migrate mailboxes from one Microsoft 365 or Office 365 organization to another

If you want collaboration and access to applications across different tenants, while maintaining the organization’s ability to evolve and manage user lifecycles efficiently you can use Cross-tenant synchronization This feature is particularly useful for organizations that own multiple Microsoft Entra tenants and wish to streamline intra-organization cross-tenant application access.

Also, you can use Microsoft Entra B2B collaboration which allow organizations to securely share their applications and services with external partners and guests.

Reference: https://answers.microsoft.com/en-us/msoffice/forum/all/merge-multiple-o365-tenants/48a2cafe-50b3-4234-af2f-133df2b5a8fe

Hope this helps. Do let us know if you any further queries.

Thanks,
Akhilesh.

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.
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1 person found this answer helpful.
Akhilesh Vallamkonda 10,325 Reputation points Microsoft Vendor

2024-06-10T03:52:18.8366667+00:00

Hi @Christoph Nellis
Following up to see if the above answer was helpful. If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Christoph Nellis 20 Reputation points

2024-06-10T06:53:58.9566667+00:00

Hi, thank you for your answer.

I should have mentioned that for accounting reasons it is necessary to keep the 2 tenants. So migrating users to another tenant is not an option, unfortunately.

But if i understand the articles above right it, Cross tenant Synchronisation would give me the wanted solution. Is that possible with Microsoft 365 E3 license on the one tenant and Microsoft 365 Business Standard on the other tenant?

BR
Chris

Christoph Nellis 20 Reputation points

2024-06-10T07:04:19.9866667+00:00

Hi,

thank you for taking time to read and answer to my question.

I should have mentioned it is mandatory to keep the 2 tenants separated for accounting reasons, so migrating users is no option, unfortunately.

If I understand the article about Cross tenant sync correctly, this is the functionality that i need. Follow up question to that: I have Microsoft 365 E3 license on one tenant and Microsoft 365 Business Standard on the other one. Would the cross tenant sync work with these licenses?

BR
Chris

Christoph Nellis 20 Reputation points

2024-06-10T07:06:47.98+00:00

Sorry for the double post. It looked like it didn't accept the first one. I was obviously to impatient to wait for it to appear.

Akhilesh Vallamkonda 10,325 Reputation points Microsoft Vendor

2024-06-13T13:38:59.5433333+00:00

Hi @Christoph Nellis
To run the Cross tenant sync you need the Microsoft Entra ID P1 or P2, the license which you are referring Microsoft 365 E3 license is included with the P1 licenses and Microsoft 365 Business Standard is not included with the P1 or P2 licenses.

Reference: https://www.microsoft.com/en-in/security/business/microsoft-entra-pricing

Akhilesh Vallamkonda 10,325 Reputation points Microsoft Vendor

2024-06-15T06:33:28.32+00:00

Hi @Christoph Nellis
Following up to see if the above answer was helpful. If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Akhilesh Vallamkonda 10,325 Reputation points Microsoft Vendor

2024-06-17T07:30:44.19+00:00

Hi @Christoph Nellis Following up to see if the above answer was helpful. If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.
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