Getting error in Designer view

HI, I am trying to integrate designer view in my app through this link https://developer.esignlive.com/guides/feature-guides/designer/ "https://sandbox.esignlive.com/api/authenticationTokens" works fine and getting authentication value but when I send request to following api I am getting "Unauthorized access" error. https://sandbox.esignlive.com/auth?authenticationToken={userAuthenticationToken}&target=https://sandbox.esignlive.com/designer/{packageId} (https://sandbox.esignlive.com/auth?authenticationToken=ZDY3YjYzN2UtNTY5NS00ZjJjLWEwZmEtNGI3ZTU4NDIyZDRk&target=https://sandbox.esignlive.com/designer/--------------------=) Can you guys help me out where I am wrong. using nodejs. Error is attached