Hello IT_Support_RD,
Good day!
If you add the permissions in Exchange, the shared mailbox should appear in the new outlook under the shared with me folder after a few minutes. You can expand it to see if this is the case.
->If it is still not appearing, you can try to add it with the following steps and check whether the shared mailbox displays in your Folder list under this folder.
- right-click on the account name or shared with me folder in the left navigation pane, and then choose Add shared folder or mailbox.
- In the Add shared folder or mailbox. dialog box, type the name or email address of the shared mailbox, and then click Add.
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Looking forward to your response.
Best Regards,
Ashraf.