Quick answer
Sitemaps use a specific namespace.
Sitemap Wrong Namespace
Sitemaps use a specific namespace. Wrong or missing namespace can cause parsers to ignore or fail.
Common causes
- Missing xmlns.
- Wrong namespace URL.
How to fix
- Add xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" to urlset.
FAQ
- Namespace?
- http://www.sitemaps.org/schemas/sitemap/0.9.
- Where?
- On urlset element.
Fix it now
Try in validator (prefill this example)