This is a small sample add-in that displays a Dialog when sending email by Outlook on the web.
This add-in works fine with Outlook on the web version 20210419002.11 or earlier.
In version 20210913004.06, the Dialog will not be displayed and email cannot be sent. However, if i change displayInIframe to false, it works fine. (In this case, the dialog is displayed in a separate window as expected.)
