I have a Vizio TV that has HDCP 1.4, no 2.2, and a Sonos wireless sound bar attached. I have set the display to 1080, I have disconnected power to both the TV and the Streaming Stick+ and have unplugged the soundbar (I did not disconnect the soundbar from the TV) and still get the purple screen with the HDCP error. Is there anything else I can do?
Have you tried different HDMI inputs on your TV?