no, a shared mailbox can only be accessed indirectly through because the Microsoft license agreement states that you must assign a separate license for every human. Once you license everyone, then you can use a shared mailbox using the Outlook Mobile App (not Activesync).
https://support.microsoft.com/en-gb/office/add-a-shared-mailbox-to-outlook-mobile-f866242c-81b2-472e...