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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
The crawlers may be blocked inside of the robots.txt file. In Screaming Frog change the User Agent to Googlebot and recrawl the site. If that doesn't work you'll have to check the server log files inside of the hosting account for the site. Those may tell you what the crawl doesn't work.