Sorry, Netflix support isn't coming to the Apple TV app
As quickly as it came, support for Netflix in the Apple TV app has been removed, and it turns out it wasn't supposed to exist at all.

Netflix confirms Apple TV app integration was just a bug
Earlier we saw what appeared Valentine's Day truce between Netflix and Apple, but unfortunately, that isn't the case.
On Friday morning, US Netflix subscribers were prompted to connect their Netflix account to the Apple TV app. For a short time, Netflix series such as "Squid Game" are showing up in the Apple TV app's Watchlist and Continue Watching sections.
However, it didn't seem to last long, leaving many wondering if the feature was actively being tested for later rollout. We've since learned that wasn't the case.
A Netflix spokesperson told The Verge that Netflix's participation in the Apple TV app was an error. It has, since then, been rolled back.
So, at least for now, it looks like you'll have to keep using the Netflix app. And don't expect Netflix to be cozying up to Apple, or anyone else, anytime soon.
Read on AppleInsider

Comments
The bigger the company, the more their app sucks, seems to be the rule.
it follows the poor standard of all tech
worst communications companies are the biggest even all of them are bad at communicating. Windows biggest and chock full of bad and outright stupid interface elements. Outlook has the dumbest conventions that some reason doesn’t just follow windows dumb but takes it up a notch. Biggest Cad-BIM vendors are there by inertia not skill. The bigger the news organisation the less demanding they are on facts and more just content to fill the void.
I'm 80% sure I would have subscribed to Netflix for the first time ever, if they had introduced their products through the Apple TV+ app.