Hi @perez21989,
It’s very difficult and resource-intensive to determine whether categories and tags should be in the sitemap; so, we’ve opted to exclude them completely.
Note that the sitemap doesn’t affect ranking — it only helps bots finding new and recently updated pages.
From the plugin FAQ:
The sitemap doesn’t contain categories, images, news, etc. is this OK?
This is not an issue. Search engines love crawling WordPress because its structure is consistent and well known.
If a visitor can’t find a page, then why would a search engine? Don’t rely on your sitemap, but on your content and website’s usability.