1,332 votes81 comments · Feature Requests and Feedback » Add-in: Outlook · Flag idea as inappropriate… · Admin →
Thanks for your feedback, the feature is currently in preview. Documentation can be viewed here: https://docs.microsoft.com/en-us/office/dev/add-ins/reference/manifest/supportssharedfolders
We are actively working on making it generally available and will update the status as soon as it is done.sshakenbake commented
I agree, we have several shared mailboxes in our organization the we utilize to create cases/tasks. This feature worked fine with the manually installed plugin but does not work with the add-in created in O365 Admin Portal. Looking forward to hear that this has been fixed.