I can't launch my add-in. What's wrong?

There could be a couple of reasons why your add-in isn't launching. For example, your company firewall might be preventing you from using external add-ins, or you might not have the correct permissions enabled in Internet Explorer. Please refer to this Microsoft documentation to find out what your specific error message means: https://docs.microsoft.com/en-us/office/dev/add-ins/testing/testing-and-troubleshooting