And it's specifically that too. If I delete "Linux" from the UA and resend the request, it succeeds. If I delete just the 'x' off the end, it succeeds. If I lowercase the 'L' it fails. They are deliberately blocking Linux users from managing their Apple ID if they have one.
If I remove the "X11; " from the OS section of the UA, it succeeds. So they're sniffing for "X11; Linux" case-insensitive.
Guess Apple hates X11.
@alexbuzzbee It may be for security purposes, since X11 lets any app sneak into each other
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