I'm about to develop a SharePoint modern web part but I cannot test my web part online using Edge (IE 11 works fine). I have deleted the gcb-serve-data folder and reinstalled the cert, still I get this message "Your web part will not appear in the toolbox. Please make sure "gulp serve" is running in a web part project."

No build error. Working just fine using Edge locally, and IE11 works online but I don't want to use IE11!

Any ideas?

1 Answer 1


It's a known bug that already reported at Testing SPFx on SharePoint Tenant (From Tutorials) does not work in Edge Browser

The workaround,

  • Continue to use IE 11 or Google Chrome!.
  • Add the localhost URLs as exceptions as suggested in the above official link

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