Office 365 (Known Issues) - Message Recall Fails in Outlook
Messages cannot be recalled with any amount of consistency. This can occur for a variety of reasons: The recipient may not be using Outlook, the recipient is not logged onto the mail service provider, the message has been moved from the inbox, or the message has been read - this includes viewing the message with the preview pane so that the message is flagged and read.
Resolution Status: Unresolved. No further work can be done on UWM's part to resolve this issue, however Microsoft has acknowledged this existing issue.
It is recommended that individuals not rely on the Message Recall feature.