Sitemap lists pages that robots.txt blocks from being crawled

A sitemap.xml file is effectively a request to Google to crawl and index the pages listed in it, while robots.txt can separately block crawlers from specific pages using a Disallow rule. This check found one or more URLs listed in the sitemap that are also blocked by a Disallow rule in robots.txt, a self-contradictory instruction. Google flags these pages as "Indexed, though blocked by robots.txt," or drops them entirely, which wastes crawl budget and leaves the page in an ambiguous state where it neither ranks cleanly nor stays properly private and out of the index. Your developer should resolve the contradiction: either remove the URL from the sitemap if it is genuinely meant to be blocked, or remove the Disallow rule in robots.txt if the page should actually be indexed. Budget about thirty minutes once the conflicting URLs are identified.