Wasted an hour assuming this was an issue on my side tonight.
It’s not widely reported, perhaps because most people stay logged in all the time, but logins to Netflix specifically from Apple TV 4K are currently failing with Code 113:
“Your Netflix account name or password couldn’t be verified. Please try again.”
It doesn’t matter if the password is valid or invalid.
Netflix Twitter account confirms they are working on a fix: https://twitter.com/Bridom51NY/status/1349495994396913665?s=20
I guess good to know even a company like Netflix can totally screw up basic login. Will be very interesting if they ever explain what went wrong.