Outlook 插件不应该在您的主邮箱之外激活.这是故意禁用的.在您的主邮箱下打开时，您看到的内容可能是 Benoit 的错误.

I am building apps with the new technology of Office add-ins (formerly app for Office).

The add-ins activate well when registered globally for the Office 365 tenant or individually by user (mechanical gear > manage add-ins).

I would like my add-in to work with Office365's shared mailboxes. The add-ins do not load in Outlook desktop or in OWA when the shared mailbox is open alone.

However, I managed to make it work when setting the shared mailbox as a shared folder displayed under my primary mailbox, as explained here (see picture below). It is better than nothing but not an acceptable solution, I would like my add-ins to be displayed when consulting my mailbox in Desktop client and in OWA when using the "Open another mailbox" (see link above).

My question is then: how to make add-ins working with shared mailboxes? A possible solution is: a shared mailbox seems to be related with a special kind of user. Would it be possible to install the add-in for this special user in order to have the add-ins always working with shared mailboxes?

Edited: Not supported for now. I created a feature request in Office365 User Voice. Consider bringing your vote to it.

Outlook add-ins are not supposed to activate outside of your primary mailbox. This is intentionally disabled. What you're seeing with it displaying when opened under your primary mailbox there Benoit is likely a bug.