Since April 2015, YouTube have drop support its old Feed urls. They are now replaced them with following Feed URL.
https://www.youtube.com/feeds/videos.xml?channel_id=CHANNELID
https://www.youtube.com/feeds/videos.xml?user=USERNAME
https://www.youtube.com/feeds/videos.xml?playlist_id=playlist_id
Example:
https://www.youtube.com/feeds/videos.xml?user=AndroidAuthority
https://www.youtube.com/feeds/videos.xml?channel_id=UCjXfkj5iapKHJrhYfAF9ZGg
https://www.youtube.com/feeds/videos.xml?playlist_id=PLidNKjOp2tc7nf0ZZl2nNH6hQk9Fa_Rkh
https://www.youtube.com/feeds/videos.xml?channel_id=CHANNELID
https://www.youtube.com/feeds/videos.xml?user=USERNAME
https://www.youtube.com/feeds/videos.xml?playlist_id=playlist_id
Example:
https://www.youtube.com/feeds/videos.xml?user=AndroidAuthority
https://www.youtube.com/feeds/videos.xml?channel_id=UCjXfkj5iapKHJrhYfAF9ZGg
https://www.youtube.com/feeds/videos.xml?playlist_id=PLidNKjOp2tc7nf0ZZl2nNH6hQk9Fa_Rkh
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