-->Sideload the add-in. Tip There is currently an issue with the self-signed certificates generated by the Microsoft Office Project Generator which will cause browsers to report that the add-in site is not secure, and will block the add-in from loading in Outlook clients. This problem persists even after trusting the generated certificates. For more information and workarounds, see on GitHub. • In your command prompt/shell, make sure you are in the root directory of your project, and enter npm start.
This will start a web server at and open your default browser to that address. • If your browser indicates that the site's certificate is not trusted, you will need to add the certificate as a trusted certificate. Outlook will not load add-ins if the site is not trusted. See for details.