Author links not in sitemap

Hi,

I enabled including author urls in the sitemap generator settings on my site and noticed that only a few of the urls were added. I am using Yoast SEO plugin as well but have disabled generating the sitemap there. Any idea on how to get all author urls added to the sitemap?
Link – https://www.gounesco.com/sitemap.xml

Ajay

https://www.ads-software.com/extend/plugins/google-sitemap-generator/