I recently changed the URL structure of a site I'm working on. Today, I got an email notice from Google Search Console on 'Increase in “404” pages on mydomain.com'. Actually, not surprising considering the changes.
But when I went to search console, looked at the message and clicked 'Check crawl errors', it shows 'no data' in the bottom pane. The Desktop -> Not Found pane notes 170.
I went through the same thing about a week ago, and marked a done of URLs resolved.
I also did a fresh 'fetch, render and index'. Didn't change anything.
How can I see what the problem URLs are?