Sharing the copy of a document from an office application to outlook classic does not initialize composeType

[Discolai]

Provide required information needed to triage your issue

Outlook classic addins are unable to get the compose type of messages when sharing a copy of an office document to outlook.

Your Environment

• Platform: PC
• Host: Outlook Classic
• Office version number: 16.0.17928.20156
• Operating System: Windows 11

Expected behavior

Office.context.mailbox.item.getComposeTypeAsync should return Office.MailboxEnums.ComposeType.NewMail

Current behavior

Office.context.mailbox.item.getComposeTypeAsync returns an AsyncResult with the following error

{"name":"InternalError","message":"The operation failed.","code":5001}

Steps to reproduce

1. Open a new word document and save it to disk (do not save it to onedrive or sharepoint)
2. Share it as a copy to outlook (File -> Share -> Attach a copy instead)
3. Any calls to Office.context.mailbox.item.getComposeTypeAsync will fail in this context. Both for add ins running as a launch event and in task panes

Context

We are currently working around this issue by logging the error and returning Office.MailboxEnums.ComposeType.NewMail when Office.context.mailbox.item.getComposeTypeAsync fails. However, this leads to a lot of noise, since this is a common use case for our users.