[progbits]

Confusingly, mkbhd the user and channel are different:

https://www.youtube.com/user/mkbHD

https://www.youtube.com/c/mkbhd

For some reason though using channel_id=mkbhd doesn't work. This is a working link: https://www.youtube.com/feeds/videos.xml?channel_id=UCBJycsm...

It is embedded on the channel page as <link> element, your RSS reader should accept the web page link and figure it out.

[mdp2021]

Yes, it is best if you use the "unique ID", available in the source HTM in case the URL contains a "human readable" version.

[bhrgunatha]

My utility format the feed url by extracting the relevant suffix from the url slug when it includes:

"/user/"

"/channel/"

"/playlist?list="

I think the newer slug format for channels is "/c/" in which case I think you do have to extract it from the HTML source, but they now include the feed URL anyway.

<link rel="alternate" type="application/rss+xml" title="RSS" href="FEED_URL">