404 Sitemaps ping is deprecated

I have the same problem.

Google just stopped supporting the sitemap ping protocol. Bing did the same a while ago, but they use an alternative - IndexNow (similarly to Yandex). Thankfully Google claims you don't need to submit your sitemap anymore for it to see changes and if it comes to other search engines, you are covered with this module, as it also supports the IndexNow protocol.

I will be pushing an update forcefully disabling sitemap pinging for Google. Until then, you can just disable it via UI here: /admin/config/search/simplesitemap/engines/settings

See 📌 Google sitemaps ping endpoint has gone away Active .

Let me know if this helps.

Closing this support ticket as fixed.

Automatically closed - issue fixed for 2 weeks with no activity.