@Mr_Roger_Dodger1 To check if this is indeed an issue and how to fix it, follow these steps:
Verify the Issue: First, confirm if the pages are indeed returning 4xx errors. Use a web browser, visit the URLs of the reported pages, and check if you receive a "404 Not Found" error or any other 4xx error. If you don't encounter any issues, MOZ's data might need updating or re-crawling.
Check Blacklisting Status: Verify if the website or specific pages have been blacklisted by using online tools that check for website blacklisting. These tools can scan various blacklists and report if your site is listed. If you find any blacklisting issues, follow the steps provided by the respective blacklist to remove your site from the blacklist.
Inspect Page Content and Links: Review the content and links on the reported pages. Ensure that they comply with Google's quality guidelines and are not engaging in any spammy or manipulative practices. Check for any malicious code or suspicious activity that might trigger security concerns.
Submit Reconsideration Request: If you find that your pages have been blacklisted or flagged by Google, submit a reconsideration request through Google Search Console. This is a formal request to review your site again and lift any penalties or blacklisting.
Technical Audit: Conduct a comprehensive technical audit of your website to identify any underlying issues that might be causing these errors. Use SEO auditing tools to scan for broken links, crawl errors, and other technical SEO issues.
Monitor Performance: Keep monitoring the relevant pages and their rankings. If they continue to rank well on Google and attract organic traffic, the MOZ report might have false positives. However, don't overlook any potential underlying issues and continue to improve the overall health and performance of your website.