This situation may come true if you have Onpremises Exchange and Online tenant Lync.

Then you need to add a SIP address with the same name as the user is in the Online tenant.

And here's the script:


$mailboxes = Get-Mailbox -OrganizationalUnit contoso.local/Users/someOU

foreach ($mailbox in $mailboxes) {Set-Mailbox -Identity $mailbox -EmailAddresses (($mailbox.emailaddresses) +="SIP:$($mailbox.alias)@domain.fi")  }


If you want to add multiple domains just copy / paste the line and alter the domain.fi part.

Happy Powershelling!

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