Adding Shared Mailboxes to Web Email
If you have access to a shared mailbox, it will automatically show up in the Outlook desktop program. However, it will not automatically show up in your web email. You can add it manually
Open your OTC web-based email in the browser of your choice. You can get to it through MyOTC, or by visiting https://outlook.office.com
Right-click your Username above the Inbox, and select Add Shared Folder or mailbox.
In the prompt, type the name of the shared mailbox you wish to add. Then, click Continue.
You should now see your shared mailbox in the left column of your web email. This will be below all of your folders like Inbox, Deleted Items, Junk Email, etc.