Google News için xml'in şu formatta olması gerekiyor:

<?xml version='1.0' encoding='UTF-8'?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
     xmlns:news="http://www.google.com/schemas/sitemap-news/0.9"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9
       http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd
       http://www.google.com/schemas/sitemap-news/0.9
       http://www.google.com/schemas/sitemap-news/0.9/sitemap-news.xsd">
 <url>
    ...
 </url>
</urlset><?xml version='1.0' encoding='UTF-8'?> <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:news="http://www.google.com/schemas/sitemap-news/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd http://www.google.com/schemas/sitemap-news/0.9 http://www.google.com/schemas/sitemap-news/0.9/sitemap-news.xsd"> <url> ... </url> </urlset>

Kaynak:
https://support.google.com/news/publisher-center/answer/9607107?hl=tr

Ayrıca online xml validatorler var onlardan birisinde deneyip hata var mı kontrol edebilirsin.