Apple TV thinks I don't have a subscription for some reason

I got apple music with the student discount last month, and I've been using it ever since, and it's been great, and I've had Apple TV on my phone and been using it very occasionally as well, and so I wanted to watch on my laptop, so since it's not a MacBook I have to use the Apple TV website on Google Chrome, and when I signed in.. it just isn't working and is asking me to add a card. The apple music website works though