Failed to open the added source. when adding the WinGet repo source

[winthebugx]

We have compeleted the deployment and trying to add the private repo as source

winget source add --name "name" "https://function.azurewebsites.net/api" -t "Microsoft.Rest" --verbose-logs
However we are getting an error
Failed to open the added source.

Has anyone added the private repo successfully? Do we need to update all of the functions to have authlevel to be authLevel: anonymous?

Thanks
Winnie