@bswica
We are not sure why Google says it cannot read the sitemap. The sitemap loads as expected here https://myyundo.com/sitemap_index.xml.
Indeed, your most recent post https://myyundo.com/sls-and-why-you-should-avoid-it/ appears in Google here.
We suggest the following actions:
1. Clear all your caching from your theme, plugin, server, CDN like CloudFlare or browser. If you are not sure how to clear caching from theme/plugin please speak to those authors. If you want to clear cache from the server, please speak to your host provider. To clear the cache from a browser use this guide:?https://kb.yoast.com/kb/how-to-clear-my-browsers-cache/.
2. Delete your sitemap in Google. Doing so will not hurt the SEO of the site. This guide explains more (scroll to the bottom):?https://support.google.com/webmasters/answer/183669?hl=en.
3. Submit the sitemap again. Be sure to submit only sitemap_index.xml and nothing else.?This guide explains more:?https://kb.yoast.com/kb/submit-sitemap-search-engines/.
4. Monitor the results to see if the issue resolves.
@coreyhammond
If you are experiencing an issue please create a new topic. That way we can focus on the particulars of the issue you are having.