When using the “XML Sitemap Generator for WordPress” plugin, if the "Include sitemap in HTML format" checkbox is checked, you may get a warning in Google Search Console that you have been excluded by the noindex tag. This is due to the fact that a sitemap in HTML format is not allowed to be included in the noindex tag.
This means that the sitemap in HTML format is excluded from the search engine index due to the noindex tag. Therefore, to avoid this problem, you need to uncheck the "Include sitemap in HTML format" checkbox in the “XML Sitemap Generator for WordPress” settings.