You can try the quickest method first:
Quick Method (Web Outlook)
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Right-click on Folders
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Select Add shared folder or mailbox
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Enter the shared mailbox name
If that does not work, please follow the instructions below based on your device:

Windows (Outlook Desktop)
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Open Outlook
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Click File → Account Settings → Account Settings
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Select your email account, then click Change
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Click More Settings
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Go to the Advanced tab
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Click Add
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Enter the shared mailbox email address
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Click OK → OK → Next → Finish → Close
Outlook Web (Office 365)
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Go to Outlook via MyUB or portal.office.com
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Click your profile icon (top right)
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Select Open another mailbox
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Enter the shared mailbox email address
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Select Open
Mac (Outlook)
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Open Outlook
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Click Tools → Accounts
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Click + → Open Shared Mailbox
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Search for the mailbox and click Add
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Close the window
Please let us know if you have any issues or if the mailbox does not appear after completing these steps.
Thank you,
OTS Call Center