Hi @sushilsth21, I found out how to make it work. You actually have to create a new dev store with that special kind of preview enabled. A normal dev store won't do. See here.In the UI you can then enable the respective extension preview: Best,Hagen 

Hi Oscprofessional, thank you so much for your reply. Unfortunately this does not solve the error. The configuration just allows to change the normal acces scope for an app, created by the shop owner. But even then those are normal access scopes. The...

Getting the exact same error for the tutorial: { "data": { "checkoutServerExtensionCreate": null }, "errors": [ { "message": "Access denied for checkoutServerExtensionCreate field. Required access: The shop must have access to che...