I can't watch Severance episodes on Apple TV with my Apple One subscription

I'm a subscriber to Apple One which includes Apple Tv. I wanted to watch Severance on my computer and I did see the first episode and then it tells me that I have to subscribe to watch the other episodes ? But I already am through Apple One and I'm sure that I'm connected to my account.

I tried to find answers on this very forum, but honestly the answers I found don't explain anything, they're too broad, too technical, and I doubt they were written by a human being. So please, don't give me a generated answer, it's infuriating and it doesn't help at all.

[Re-Titled by Moderator]

Original Title: I want an answer.