Unfortunately, in the "Outlook New" program, it is not automatic like in Outlook Classic.
To access a SHARED MAILBOX in the "Outlook New" program, follow the following steps.
STEP 1: Right click on INBOX
STEP 2: Click "Add Shared Folder or Mailbox"
STEP 3: Type the account email you are wishing to add
STEP 4: It will appear in the "Shared with Me" category at the bottom.

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