Q: error code on apple tv when trying to watch netflix i get error  139:NFErr_MC_AuthFailure

https://help.netflix.com/en/node/40

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https://support.unblock-us.com/customer/portal/questions/308714-netflix-error-13 9-nferr

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Apple TV - Netflix Streaming issue

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appletv netflix 139:NFErr_MC_AuthFailure

I have the same problem, whenever I try to view any content on Netflix all I get is the 139:NFErr_MC_AuthFailure message. Tried with other devices and the problem seems to be only with ATV (3rd gen, software updated)

well, i believe i found a solution. Go to Netflix no a computer, login and go to account settings. Then, choose the opción CLOSE SESSIONS ON ALL DEVICES. go yo ATV, close the Netflix session AND then log back in. This worked for me, hope it works for you too

If you are using static routes in your router blocking Google DNS remove it and try again. This will fix the error 139 message.