The action URL request with header is currently not available, we have to enter the private key manually after you send the command.
And I have attached one demo in the comment.
Attachment: 11You have to Login for download or view attachment(s). No Account? Register
Can you check if the authorization popup will show when you send this command in your browser.If not , maybe your browser prohibit the popup.
And the additional authorization is needed , the action url with private key headers is not supported yet.