I want help about rankmath not being able to generate sitemap for CPT

I want help about rankmath not being able to generate sitemap for custom post type generated by anspress plugin.
Recently I use anspress plugin to create our community Q&A page, however I am not able to automatically generate sitemap with rankmarth, please help me.
If possible I will send you user access.
This is our Q&A page
https://nghebaohiem.net/community/
And here is the sitemap created by rankmath but got a 404 error
https://nghebaohiem.net/question-sitemap.xml
https://nghebaohiem.net/answer-sitemap.xml