

Then press Apply->OK->Next->Finish and go back to your main Outlook window.

Now, choose the Account Settings option from the list.

I would keep the Shared mailbox how you have it and just utilize Teams itself with SharePoint etc. Search for the mailbox you wish to add in the search field, and then click Added to Your Personal Mailbox. Click the Change button at the top of the window… Click More Settings… Click the Advanced tab. Search for the mailbox you wish to add in the search field, and then click Step1 : Open Outlook and login with any member account credentials. Select +Add a mailbox then enter a name and email address for the mailbox.
