MultiSite with different domains

Hi,

I have a website network build on WordPress.

It was built using sub-domains not sub-directories, but all those sub-domains are mapped to a different domains with this plugin:
https://ww.wp.xz.cn/plugins/wordpress-mu-domain-mapping/

Used:
example.com —–> example.com
1.example.com —–> exampleone.com
2.example.com —–> exampletwo.com

Anyway I installed your plugin and I can only see sitemap under main domain (example.com), but not on any other.

Can you please help me out with this?

Thanks in advance!

https://ww.wp.xz.cn/plugins/bwp-google-xml-sitemaps/