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My Apple TV keeps coming up with A27 HDCP… - Apple Community
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HDCP Error: What It Is and How to Fix One
HBO Max stopped working today on my AppleTV 4k. It gave a random HDCP error and now it only plays audio. Reboot AND reinstalling the app did not fix it. : r/HBOMAX
How to fix Hdcp error?
New HDCP error message. : r/appletv
Are You Facing HDCP Error on Apple TV? Here Is a Fix