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Access to multiple Business Central tenants using a single Entra ID account

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Posted on by AD-11010952-0

Hi,
We are currently running Microsoft Dynamics 365 Business Central in Tenant A.
We have recently acquired a company in another country that is also using Business Central, that is in a separate tenant (Tenant B).

Our current plan is not to migrate Tenant B Business Central into Tenant A , but instead keep Tenant B as a separate tenant and treat it as a resource tenant.

We have already configured Microsoft Entra ID cross-tenant access, where selected users from Tenant A are added as members in Tenant B.

We would like to understand the following from a Business Central perspective:

Is it possible for our finance users to access both Business Central tenants using a single Entra ID account (e.g. user@company1.com in Tenant A)?
If yes, how does the user experience work in practice:
- How do users switch between the two Business Central tenants?
- Is switching done via the Business Central environment selector, direct URLs, or sign-out/sign-in?
Are there any limitations or best-practice recommendations when running Business Central in this setup?

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Dynamics 365 Business Central

Dynamics 365 Business Central migration

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Pallavi Phade 5,399 Super User 2026 Season 1 on at

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Namaste @AD-11010952-0

If you have given access to user in multi-tenants , Tenant Id will change in url . Lets say for example i m given access to 3 environement under 1 tenant URl will be same and i can easily switch to any of environement .

Tenant Id will change , if you give access to users to other Tenant then URL will also change . They have to open two tabs .

Hope this answered your query

Warm Regards

Pallavi Phade

www.linkedin.com/in/pallaviphade131116

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Dhiren Nagar 2,880 Super User 2026 Season 1 on at

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Hi,

Yes as mentioned by you, your users can access both tenants once you have included Tenant A users in Tenant B as guest users and assigned licenses. I think this you already have done. If not just invite Tenant A users in Tenant B as guest users and then assign them license to business central.

Regarding user experience, well you have to manage it with URL, by default when users from Tenant A will login it will open Tenant A Business Central only. But if they use specific url i.e. businesscentral.dynamics.com/tenantid/environmentname, in that case Tenant B will open. This is the best you can get with multi tenant access. Other experts in community may add to this information.

As regards to best practice, its the cost benefit analysis you need to do between acquiring additional licenses for Tenant A users in Tenant B or migrating Tenant B production into Tenant A where 2nd production will be billed (As per Microsoft documentation additional production is billed).

Another factor to consider is use of other Microsoft services like outlook, teams, excel. So if you are also using it, and Tenant B is separate legal entity with its own domain you may need to keep two tenants separate. Another thing to consider is Domain.

I hope this helps.

Regards,

Dhiren.

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OussamaSabbouh 11,612 Super User 2026 Season 1 on at

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Hello ,

Yes, this is fully supported: users from Tenant A can access both Business Central tenants with one Entra ID account as long as they are added as Members in Tenant B and licensed there. In practice, there is no tenant switch inside Business Central — the environment selector only works within one tenant. Users simply access each tenant via direct URLs (most common) or from the BC home page listing available tenants, with no sign-out/sign-in needed if the session is active. Key points: licenses are per tenant, data is fully isolated, admin/setup is per tenant, and best practice is to use clear naming + bookmarks to avoid confusion. This setup is common for acquisitions and regional separation.

Regards,

Oussama Sabbouh

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YUN ZHU 98,421 Super User 2026 Season 1 on at

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It's possible, but as Dhiren mentioned, you can only manage it via URL.
Switching apps within a single Microsoft 365 application is not supported.

Please note that the integration of the BC environment, Microsoft 365, and Power Platform, which you are logged into as a guest user, is unavailable.

Thanks

ZHU

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