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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.
@LoganRay This was our issue. Didn't know Moz tries to retrieve the HTTP robots.txt first. Our HTTPS redirect was not working on static files only, so the HTTP path to the robots.txt was failing. We did not notice it because the HSTS policy was forcing the browser to redirect.