Dear Microsoft,
I need your assistance, please.
Our users work with private and with shared mailboxes in O365 (mainly from Web).
When our users reply to inbound emails from shared mailboxes we want them to be able to use their private signatures automatically. The goal is that when user A composes a new email in a shared mailbox then a signature <A> is automatically inserted into an email body, if user B composes a new email in the same shared mailbox, then signature <B> has to be automatically inserted.
Right now a signature defined in a standard way in a shared mailbox will be used by all users of the mailbox and we do not want that. We know that it is possible to create list of signatures for different people and then users can choose a signature manually but we do not want that either, because sometime there are 10 or 20 users working with the same shared mailbox and they can't waste time on scrolling through the list of signatures to choose their own.
We had an idea to create an event-driven add-in for Outlook, which would work on mail compose event, which would read SSO access token, fetch from it a username and a user email and then use this info for email signature. We managed to implement it and it worked exactly as we expected.
The problem is that we can't install this Add-in for Shared Mailbox, it only works for private users' mailboxes. When we tried to install it for shared mailbox we've got an error "Installation failed: The operation on mailbox failed because it's out of the current user's write scope."
We googled this error and found two articles in the Internet. One without response on this site: [https://video2.skills-academy.com/en-us/answers/questions/506662/outlook-owa-addin-installation-permission-issue-(d
Another one here: [https://github.com/OfficeDev/office-js/issues/1877
Dear Microsoft, please tell me,
- is it even possible to install Outlook Add-in for Shared Mailbox?
- if answer is "no", what can you advise to resolve the described task?
Yuriy.