Hi Team, Outlook Add-In is not enabled when the user has selected a mail (not yet read) while the reading pane is off. As a result, while developing any custom add-ins, we are not able to retrieve t...
This behaviour is by design in both the Outlook desktop client and Outlook Online:
https://learn.microsoft.com/en-ca/office/dev/add-ins/outlook/add-in-commands-for-outlook?tabs=xmlmanifest#where-do-add-in-commands-appear-in-the-ui