FrameworkExtensions Unable to Debug

Question

Followed the steps in the below link to create a simple Framework Extension

https://dev.office.com/sharepoint/docs/spfx/extensions/get-started/build-a-hello-world-extension

Observed Behavior

Unable to get debugging to work , (Not receieving the 'Allow Debug Manifest' Pop up and no alerts!).No paremeters are being encoded in the url and No Errors in command 'gulp serve --nobrowser' Below is the url that I am appending along with my

 List/DocLib Url?loadSPFX=true&debugManifestsFile=https://localhost:4321/temp/manifests.js&customActions={"9c43dad8-b79b-4221-83d3-837b3d562fe6":{"location":"ClientSideExtension.ApplicationCustomizer","properties":{"testMessage":"Hello as property!"}}}

Any ideas on what could be wrong here?

Answer 1

As mentioned in comments, currently SPFx extensions are currently in preview mode and are not production ready. You can test them only in Developer tenants. It will be available later across other tenants when they reach general availability.

Reference - SPFx extensions overview