Mac - Shared mailbox not showing in Outlook for Mac
If anyone is using a Mac and reports shared mailboxes are not appearing, complete the following steps in Outlook, on the Mac.
Settings > Accounts > (Select proper account) > Delegates & Sharing > Shared With Me > + > Type in the email address > Add
(IT can also verify that the user is a full delegate of the shared mailbox. Keep in mind, shared mailboxes do not have an assigned license nor do they need one.)