How come the Discuss button is disabled on my post?

Question

I just posted a link to a YouTube channel I created several years ago, to help people learn mathematics. A few seconds after posting, the "Discuss" button was disabled on my post, even though it seems to be on for everyone else. I also don't see the post in an incognito window. I guess it's shadowbanned? Am I shadowbanned as well? Going to post this and see if the result is the same. Or perhaps it is something about that link. I'm not going to post the link here.

mtmail · Accepted Answer

I clicked 'vouch' now on the submission. Probably auto-disabled because youtube videos don't fit the Show HN guidelines usually. It just to avoid "Show HN: I wrote a blog post about ..." instead of the user doing a normal submission. https://news.ycombinator.com/showhn.html

EGreg · Answer

Testing the discussion feature