Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi Hash821,
Greetings, as far as I know, there is no owner for shared mailbox, there are only accounts that have full access, send as or send on behalf of permission to it, and if you would like to review members or other settings of shared mailbox, you can contact your admin to check it in Admin Center > Groups > Shared mailboxes.
If I have some misunderstanding, please feel free to correct me with more details.
Best Regards,
Betty