Hey everyone! I'm looking for some guidance on a situation we're facing at my organization. We have two branches: one in the UK and one in the US. Each branch has its own email domain and Microsoft Tenant. The US branch is considering merging to use a single domain, which would be the one hosted in the US. However, our UK branch currently relies on multiple SSO integrations and has established trust relationships with other business units. We'd like to retain our UK tenant for Entra-ID but also make use of the US email domain. Is there a way to link our UK tenant with their US tenant, so the US can be the main host for the domain and DNS? But we still want to keep utilizing our email and integrations in the UK. Any advice would be hugely appreciated!
3 Answers
Cross-tenant synchronization can help, but remember, it's really aimed at collaboration rather than actual tenant merging. It's important to think about data residency laws too. If everything needs to comply with GDPR or similar regulations, that’s something you need to keep in mind. The long-term approach would be to migrate users into a single tenant; it simplifies management and makes everything easier to use when everyone is under one domain.
You could explore tenant-to-tenant setups, but it can get tricky. You might be able to achieve some level of collaboration through B2B setups, though for email, you’re limited to one domain per tenant. The best way forward might be to consider how to manage email addresses across the two tenants efficiently. Just remember that if the higher-ups want everyone under one roof, a full migration to a single tenant might be the cleanest option.
Unfortunately, there isn't a simple way to merge the tenants directly. You'll likely need to do a manual migration since Microsoft doesn’t support sharing domains between tenants. So, either your tenants need to be migrated, or you'll have to manage resources separately on each side. It might be a bit of a headache, but that’s usually how these situations play out.
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