Merging two on premise domains (Primary and routable domain) to office 365 domain

Question

Hi , i have a client who wants to merge two on-premise domains to a domain in office 365.can this be possible?&nbsp;&nbsp;If yes, kindly share how it can be done.&nbsp;thank you.

adam deltinger · Answer

You need to add both domains to the same office 365 tenant! There can only be one Ad connect to a single tenant , so if you need sync, either consolidate Ad’s or create a trust so accounts can be synced from one Ad connect from both domains! Also set all accounts to the routable domain UPN in both AD’s

vasilmichev · Answer

Adam, multi-forest sync to a single AD tenant has been supported for years now:&nbsp;https://docs.microsoft.com/en-us/azure/active-directory/hybrid/plan-connect-topologies#multiple-forests-single-azure-ad-tenant
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But I'm not so sure what the OP means here, so lets wait for additional details.

adam deltinger · Answer

Of course it have :) was thinking the other way around! Sorryhttps://docs.microsoft.com/en/azure/active-directory/hybrid/plan-connect-topologies

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Merging two on premise domains (Primary and routable domain) to office 365 domain

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