If you have problems running the add-in, take these steps.
- Close any open instances of Office.
- Close the previous web server started for the add-in with the Stop Previewing Your Office Add-in Office Add-ins Development Kit extension option.
The article Troubleshoot development errors with Office Add-ins contains solutions to common problems. If you're still having issues, create a GitHub issue and we'll help you.
For information on running the add-in on Office on the web, see Sideload Office Add-ins to Office on the web.
For information on debugging on older versions of Office, see Debug add-ins using developer tools in Microsoft Edge Legacy.