When I try to watch Netflix on my Mac and use Screen Mirroring at the same time, I get an error from Netflix that reads like:
“Whoops, something went wrong…There appears to be a display problem. Please ensure your monitor is HDCP compliant and is not mirrored using Airplay.”
This problem only exist on the Safari browser. When you use the Chrome or the Firefox browser, the same content (in this case “Designated Survivor” from Netflix) will play just fine.