Using Classic Outlook on Windows for personal email, calendar, and contact management
Hi jdavid_jd,
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May I know if you can see the shared mailbox in your Outlook application interface? After your admin has added you as a member of a shared mailbox, close and then restart Outlook. The shared mailbox should automatically display in your Folder pane in Outlook. Reference for you: https://support.microsoft.com/en-us/office/open-and-use-a-shared-mailbox-in-outlook-d94a8e9e-21f1-4240-808b-de9c9c088afd
If the shared mailbox is displaying in the Outlook interface, but you cannot access. May I know what the specific situation you have? You cannot expand it or is there any error message displayed when you try to access it? it will be great to provide more related screenshots/description for us to assist us picture this issue better.
Besides, I suggest you check if you can access the shared mailbox via the Outlook on the web. Sign in to your account in Outlook on the web (https://outlook.office365.com ) > On the Outlook on the web navigation bar, click your name. A list appears > Click Open another mailbox > Type the email address of the other mailbox that you want to open, and then click Open. Another Outlook on the web session opens in a separate window, allowing access to the other mailbox.
Welcome back to us if there are any updates.
Thanks,
Linda