Office 365 Shared mailboxes which I have full access to don't appear within Mac Outlook 2016

I have been granted full access to two Office 365 Shared email boxes.

These two email boxes both appear in the left-hand column of my Outlook 2016 for Office 365 on my Windows 10 computer.

However, these two email boxes don't appear anywhere within Mac Outlook 2016 for Office 365 on my Mac OS X computer which is running macOS High Sierra Version 10.13.4.

What do I need to do to add these two shared email boxes so that they will appear within my Mac Outlook 2016 for Office 365 on my Mac OS X computer?

All Office and Mac updates have been installed on the Mac computer. Mac Outlook is running version 16.12 (180410).

IT GuyNetwork EngineerAsked:
Who is Participating?
FOXActive Directory/Exchange EngineerCommented:
The shared mailboxes may not be automapping for Mac OS
Manually add

ref link:
IT GuyNetwork EngineerAuthor Commented:
When I attempt to manually add these folders using the methods described in the URL link mentioned above the shared mailboxes are not found and they are not able to be added.

What other methods can I use to get these two shared mailboxes to display within Mac Outlook 2016?
FOXActive Directory/Exchange EngineerCommented:
Is the mac either on the network or vpn'd in to the network.  
Have you entered the name of the email address of the  Shared Mailbox exactly as it reads in Exchange?  Check your Global Address List for the correct email address.  If you are using the Display Name  and it has spaces in it you may be required to have it in quotes 'John Doe'.
email addresses don't have spaces.
IT GuyNetwork EngineerAuthor Commented:
This worked after I changed the shared mailbxes so they were no longer hidden.

Then after adding them, I hid them again.
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