You might get an error message from Netflix when you play a movie on Netflix and screen mirroring it to your TV. The error message might look like this: 

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"Whoops, something went wrong...

Display Error

There appears to be a display problem. Please ensure your monitor is HDCP compliant and is not mirrored using Airplay."

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This problem would appear only when you use Safari browser. So when this problem happens, you can use the Chrome or Firefox, and everything would play smoothly.