Outlook Add-in REST API In Shared Inbox Fails: ErrorInvalidMailboxItemId - Item Id doesn't belong to the current mailbox
问题 We have an Outlook (Office JS) Add-in with a manifest configured to support shared folders, i.e. <SupportsSharedFolders>true</SupportsSharedFolders> The add-in has been running flawlessly, for many months, on a number of machines that meet the minimum requirement set of 1.8 for shared folder support. Since 22-Apr-2020 it has returned the following error when selecting an email in a shared email inbox: Status Code: 404 ErrorInvalidMailboxItemId - Item Id doesn't belong to the current mailbox