Modern Pages - Highlighted Content - empty with Card Layout

Thanks for reporting an issue. I'm the PM responsible for Highlighted content.

I'm not aware of an issue with the card view, e.g. switching from card -> list -> card layout causing any issues. If you can get me some screenshots of the property pane + layout showing your configuration, I'd be very interested in it. You can post them here, or if too sensitve, email me.

In all cases of results returning zero, I'm of course assuming documents, pages, events, issues, etc. (e.g. whatever you've set to filter already exists in the site(s) in question).

While we do have a few very specific bugs on managed property filtering, overall I'm unaware of any simple scenarios HC should support, not yet working.

Unfortunately, we don't yet support tokens (e.g. [me], [today], etc.), but that is in our backlog for the future.

Please give me specifics; we'll try to repro, file a bug, and get it fixed.