Open EMR API FHIR connection with swagger

I have tried App registration as per the video posed on the Youtube OpenEMR FHIR Lecture Series: “Lecture 1 - Overview and Use of FHIR in OpenEMR”

When i have tried to register the app it is showing “Failed to fetch”. I have attached the screenshots of the details i have given in below image.

Kindly help me out reg this issue and where i am going wrong here