Pinging an entry to Search Engines results a warning message. It says,

Sitemap

An error was encountered while trying to notify Google about this entry
An error was encountered while trying to notify Bing about this entry

Here are the logs:

HTTP/2 410 accept-ch: Sec-CH-UA-Arch, Sec-CH-UA-Bitness, Sec-CH-UA-Full-Version, Sec-CH-UA-Mobile, Sec-CH-UA-Model, Sec-CH-UA-Platform, Sec-CH-UA-Platform-Version x-msedge-ref: Ref A: 6491192020D64FE49E2D6DC0766E604C Ref B: YTO01EDGE0518 Ref C: 2023-03-31T16:34:35Z date: Fri, 31 Mar 2023 16:34:35 GMT content-length: 0

HTTP/2 200 content-type: text/html; charset=UTF-8 expires: Fri, 31 Mar 2023 16:34:35 GMT date: Fri, 31 Mar 2023 16:34:35 GMT cache-control: private, max-age=0 x-content-type-options: nosniff x-frame-options: SAMEORIGIN content-security-policy: frame-ancestors 'self' x-xss-protection: 1; mode=block server: GSE alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000 accept-ranges: none vary: Accept-Encoding
SITEMAP NOTIFICATION RECEIVED

Your Sitemap has been successfully added to our list of Sitemaps to crawl. If this is the first time you are notifying Google about this Sitemap, please add it via <a href="http://www.google.com/webmasters/tools/">http://www.google.com/webmasters/tools/</a> so you can track its status. Please note that we do not add all submitted URLs to our index, and we cannot make any predictions or guarantees about when or if they will appear.