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I'm learning how to make a SharePoint Framework Extensions Apps. I made an app which is the same like in tutorial: Deploy your extension to SharePoint (Hello world part 3). Unfortunately i can't deploy apps which are SP Extensions. I even tried to upload a template app. Every time i have message:
"The requested operation is part of an experimental feature that is not supported in the current environment."

I tried with webpart apps and everything works.

App_Catalog

  • What is the status now ? I have the header working when using debug url, then the app package deployed on first release / dev tenants do not show my header – Jeff Oct 9 '17 at 14:08
  • For me, still doesn't work but probably because I don't have Developer Tenants. – krawat10 Oct 19 '17 at 8:25
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SPFx extensions will work only on Developer Tenants.

If your tenant is on First release or General Availabilty(which looks like your tenant from the current error message) , it will not work.

To create a developer tenant, you can use either of the below 2 links:

1) https://demos.microsoft.com/Login

2) https://dev.office.com/devprogram

Reference - SPFx extensions overview

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