Office 365, Outlook for Mac, Add shared mailbox
Go to the Outlook menu and choose “Preferences”
Select the + (plus) sign to add a new account
Type in the shared mailbox address and select "Continue"
If the account isn't immediately found, choose the provider "Microsoft 365"
IMPORTANT! When prompted to Sign In, replace the shared email address with your own and choose "Next"
Enter your own university password to finish logging in.
When it tells you the account has been added successfully, you can close that window. It will be at the bottom of the folder list in the left-hand navigation pane of Outlook.