Apple TV+ low quality on browser

I have the subscription to Apple TV+, but I don't have the Apple TV box.

I watch the content throug a browser on windows and the quality sucks.

I tried with Firefox and Edge (also enabling the DRM stuff).

The specs of the pc are fine (ryzen 5 2600 and a AMD 580, 16GB of RAM) and I have 1000mbs connection.

The problem is defintly with Apple. I don't want necesseraly 4k, but at least 1080p.

I know that other lads had the same issue, someone was able to solve this? It's going on from a lot of time now, I think that is embarrasing for Apple to still have this issue.