You changed your sitemap from the website and need to tell Bing about the changes.
This is helpfull when you want your changes to appear faster on the internet via Bing.
To resubmit changes in your sitemap, you need to login to "Bing Webmaster Tools". In the left pane, select Sitemaps. Here you find all your sitemaps for your website. You select your sitemap and click "resend".
The Status will change so your can see everything worked fine.
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.