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Multiple domains in one tenant with shared mailboxes

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Frequent Contributor
I've got a tenant with 3 domain names in it, which I'm the global admin for. I already had a shared mailbox setup for sales@domain1.com. When I went to setup a shared mailbox for sales@domain2.com, it does not seem to let me. Is this expected behavior and is there another way I should be doing this to make it possible? Thanks.
2 Replies
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I wouldn't call it the expected behavior, but it's known. The reason is the alias part ("sales" in your case) and you can work around it by creating the shared mailbox via PowerShell and providing all the relevant values. Or, why dont you simply add this as additional alias on the already existing mailbox, do you really need 3 different ones?

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Another way could be to create sales(domain)@domain and add a alias. only the problem is if you reply from it people see the sales(domain)@domain.

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