Add a Shared Mailbox to Outlook (macOS)

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Open Outlook
From the top menu, select Tools. Select Accounts…
The Accounts window will be displayed. Select the Advanced… button.
Click on the Delegates tab. Beneath the Open These Additional Mailboxes section, select the plus (+) button.
Enter the shared mailbox name or email address within the provided search field and select the correct result. Select Add.
The shared mailbox account should now be added to the Open These Additional Mailboxes list. Select OK. (You might need to restart Outlook to see the mailbox).
1. You may be provided with an auto-discover prompt requesting that you allow the remote server to configure settings within Outlook. Select Allow.
Your shared mailbox should now be added to your folder list on the left-hand side of your Outlook client. You have now successfully added your shared mailbox.