这是什么原因？

[lyn0623]

[CKmedia]

That error started at least 9 days ago (April 3, 2025).
Looks like "Logged In" is the only way to access Youtube now.
Video not found error occurs when not Authenticated.
(They claim they are guarding against "Bots" unless logged in.)
Once Authenticated, we get the "old" "System.net Http..." error messages.

该错误至少9天前(2025年4月3日)开始。
看起来“登录”是现在访问YouTube的唯一方法。
未发现错误的视频在未身份验证时发生。
(他们声称他们正在防范“机器人”,除非登录。
一旦经过身份验证,我们就会收到“旧”“System.net Http...”错误消息。

Used Google translate - anything offensive is translation error. :-)