Sitemap not created

Hello everyone, I have a problem with the plugin.
I just set up the sitemap plugin by Yoast eliminating the google xml sitemap.
Some time ago I already configured the sitemap Yoast but I then switched off to use other plugins.
Now Yoast does not create the sitemap, looking ftp the sitemap is not created even though I have enabled the option to Yoast.
https://www.unavitaacolori.it/sitemap_index.xml
Google and Bing webmaster tools do not find fault and damage of course.
What can I do to get it back?
Thank you!

https://www.ads-software.com/plugins/wordpress-seo/