There was no feedback regarding why. I've never had an article rejected for any reason adn am curious, especially considering that it was written and uploaded to meet a timely content request.
I had an article rejected once, which was a real surprise, and it has been the only one.
I can only guess at why the article was rejected. Did you check for punctuation, spelling and grammar? Did all of your sentences make sense? Just a thought.
I had an article accepted and then days later it was rejected. I queried this with the site and it was down to human error. These things happen, and in all fairness I was told to resubmit it and subsequently it was re-accepted exceptionally quickly.