There is also this filing [1] from February regarding the "human authorship" requirement. Thaler was requesting that he be granted the copyright to this work as the AI was "work-for-hire". The Copyright Office found that Thaler “provided no evidence on sufficient creative input or intervention by a human author in the Work.”

So, at least in this instance, the AI created the work with insufficient creative input from a person, and thus has no human author, and is not eligible for copyright.

https://www.copyright.gov/rulings-filings/review-board/docs/...