I've resubmitted the sitemap a couple times and it keeps coming up as couldn't fetch and the type is unknown. I have input some url's in manually and had them ...
I create an sitemap.js file inside my app directory for create an dynamic sitemap but when I go to http://localhost:3000/sitemap.xml I see 404 not found.
Try Inspecting the sitemap URL itself, then click the 'Live Test' button. See what it reports under 'Page Fetch' (in 'Crawl' section) - ignore the messages ...
Even though there is a sitemap.xml created, it is not being served upon request. Instead the wp-sitemap.xml (default WP sitemap, which includes the users) is ...