You're the administrator of an on-premises Exchange Server 2010 environment that's in Hybrid mode. After migrating a few users to Office 365, you start receiving complaints that they're no longer able to send emails as their departments group.
First, follow the instructions in one of my previous blog articles to "Connect to Office 365 using PowerShell".
The following command grants John Doe the ability to send as the Facility Services group in Office 365.
Add-RecipientPermission -Identity firstname.lastname@example.org -AccessRights SendAs -Trustee email@example.com -Con
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