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Office 365 – cannot send as shared mailboxes from Outlook

I'm stealing borrowing this information from a post on Sysadmin Tips: https://www.mysysadmintips.com/windows/clients/846-office-365-cannot-send-as-shared-mailboxes-from-outlook Issue Some users started having issues sending emails from newly created Office 365 shared mailboxes. Users were added as shared mailbox members using Office 365 Admin centre. The...
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