Forum Discussion
Reachability of a domain across multiple tenants
I have a general question about an Entra scenario that we currently need to implement.
Our company consists of 3 companies (companyA.com, companyB.com, companyC.com), each with their own MS Tenant. Here, A is the parent company and B and C are subsidiaries.
Is it somehow possible, perhaps with Cross Tenant Synchronization from B, C -> A, that users from the subsidiaries can log in with the parent company's domain name in Entra, Teams & Co., and that Teams invitations can also be sent via an email address of the parent company?
So I have mailto:email address removed for privacy reasons and I would like this user to also be known as mailto:email address removed for privacy reasons in the Microsoft ecosystem. From a marketing perspective, it is important that all employees log in and are reachable with the same domain.
A migration into one tenant is probably not easily possible for legal reasons.
Thank you in advance for your assistance.
Christian
1 Reply
A domain can only be verified in a single tenant. The easy solution is to use subdomains, i.e. us.company.com, ca.company.com and so on. More convoluted solutions involve cross-tenant sync, guest users and so on, and why this can help with getting the users into a single tenant, they will still keep their own identity/email addresses, associated with the "home" tenant.
