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Are they somehow able to detect the OS by something other than the user agent headers or have you tried changing your user agent?
I have no idea how they do it. I did try some addons to change my user agent but that doesn’t work. At least it with peacock.
Run a browser on wine, they are likely detecting from widevine itself. Or try this tutorial: https://thebrokenrail.com/2022/12/31/xfinity-stream-on-linux.html