Cannot log in to Apple TV app for Windows

I had exactly the same issue (nearly drove me up the wall) - eventually Google's AI told me to install Apple Music (from the Microsoft store) on one of my PCs and sign in there - it fixed it. It's an agreement status issue and Apple needs to fix it stat (I had managed to buy a movie quite successfully on my iphone but couldn't log on to watch it on a PC, which I'm fairly sure is illegal on their part.)

Details from Gemini (Google):

1. The "Apple Music Account" Terms & Conditions Trigger

A notorious Apple account quirk on Windows prevents modern Windows apps from authenticating if the account hasn't fully registered a modern music library agreement.

1. Install Apple Music for Windows (from the Microsoft Store) on one of the PCs.
2. Attempt to sign into your Apple ID inside the Apple Music app first.
3. If it prompts you to accept new Terms & Conditions, click Agree.
4. Once Apple Music signs in successfully, close it and open Apple TV or iCloud. In most cases, they will now suddenly authorize, as the account flag has been cleared on Apple's servers. [1, 2, 3]

OK. Thank you.

We are all device-users, just as you are, in this community, so no-one here can fix bugs in Apple's software or system.

Other Windows users have faced similar situations:

Eg: Perhaps the reply given by a respected community member in this other discussion can help you: Unable to sign in to apple tv+ on my wind… - Apple Community

or

If you wish, you can send feedback to let Apple know that you suspect a bug.

You will likely not receive a reply, yet your feedback will be carefully read and logged, and if others are reporting a similar issue, Apple may release an update to address that issue: Feedback - Apple TV App - Apple

I also tried logging into the Apple TV app on Windows 11 on July 31st and had the same issue. Tried again this morning and it's still happening. I've tried two different Apple Accounts. I have uninstalled and reinstalled the app from the Microsoft Store and also "Reset" the app using Settings. Seems like something is broken on Apple's side.

How to check Apple’s System Status page:

Go to: Apple - Support - System Status

(A green dot signifies normal operation.)

If you wish: You can check through the linked "Sign in" article in the reply above. Eg: If you scroll down: there are steps to take to authorise your Windows device to play Apple purchases and rentals, if you need to.

Re: Cannot log in to Apple TV app for Windows

See whether Apple support's step-by-step sign-in method below can help, or whether that is precisely what hasn't been working for you.

Apple support's article: Sign in to your Apple Account in the Apple TV app on Windows - Apple Support

Eg: says:

"Sign in to your Apple Account in the Apple TV app

1. Go to the Apple TV app on your Windows device.
2. Select Sign In at the bottom of the sidebar.
3. Select Sign In (under View My Account), enter the email or phone number and password for your Apple Account, then select Sign In. 
4. If you forgot your password, select “Forgot password?” and follow the onscreen instructions."

Useful resource: Apple TV app user guide for windows

I wasn't implying it was a system-wide outage that would register on their system status page. I tried another PC and also cannot sign in to the Apple TV app. Something is clearly bugged under certain circumstances.

The support articles do not change the behavior.

The same thing is happening here. I can log in with Chrome but with the app from Apple TV is impossible. The first time that ive tried they even asked for the code sent to my phone to confirm the log in but nothing happened. Ive uninstalled and installed again and still cant log in the app.

And with Chrome i cant get a good quality with the stream, seems that it stops at 720p or bellow.

I have the same problem. Can no longer login through Microsoft Edge, Brave Browser, Apple TV App, or Apple Music on a Windows 11 25H2 PC.

With Microsoft Edge I get the "Two-Factor Authentication" Use a security key to sign to your Apple Account: email@domain.com. With my Yubikey plugged in usually I get a prompt for passcode then to press the button but nothing now. When I click continue it just keeps prompting the continue button.

With the Apple TV and Apple Music apps I get a different box that pops up once I login with username and password. A blank white box labeled "Apple TV" or "Apple Music" pops up and that is it, nothing more. Eventually they time out.

Thank you!!! I did this and now its working!!