Amazon prime video not working on non smart tv

For over a year I've been able to watch Amazon prime video on my old non smart Magnavox tv via the contour box.  Now it stopped working.  The error message is, "Disconnect VPN or proxy service and try again".  This tv is not connected to anything but Cox through the contour box.  My pc connects to Amazon Prime Video but not the tv.  I rebooted the contour box and tv.  Same error message. I contacted Amazon and they were absolutely no help.  The first call ended up with some guy in South Africa and the second contact, via Amazon chat, ended up in India.  Anybody have any suggestions or solutions?  Thanks.