There are a few key reasons for pages to be missing from and HREFLang XML Sitemap that HREFLang Builder generated
1. The URL did not have a country match. There is an option in the tool to allow for single pages. By default we have it set to only add URL’s to the final XML if they have at least one match.
2. The URL did not render a 200 header status code, it was either a redirect or a page not found status.
3. You have localized folders or page names and did not map them or map them correctly.