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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?
It's a known bug that already reported at Testing SPFx on SharePoint Tenant (From Tutorials) does not work in Edge Browser
The workaround,
localhost URLs as exceptions as suggested in the above official link