We have custom Outlook add-in which is displayed when user selects any email message inside Office Outlook client or inside outlook.office.com browser.
I see that Outlook add-in is not displayed when user selects an email present in the SharePoint Group's mailbox either from Outlook client or inside browser.
I tried adding SupportsSharedFolder (thinking it may support Group mailbox) referring stackoverflow question but that too is not working for Group Mailbox. Publishing Outlook add-in which uses Outlook preview element - SupportsSharedFolders
<SupportsSharedFolders>true</SupportsSharedFolders>
I would like to know if Outlook add-ins are supported by SharePoint Group mailbox or not?
Thank you!