my website let's say.... www.example.com is a WordPress website that has a sitemap like www.example.com/sitemap_index.xml generated from Yoast.
But now when I type www.example.com/sitemap.xml it does not redirect to www.example.com/sitemap_index.xml as it supposed to be... as I learned Yoast provides redirection on its own.
But there is an error... I have submitted sitemap_index.xml to Google search console it works well.
Should I worry about sitemap.xml as this displays an error every time I try it? What to do? How to resolve the issue? Please help!

[edited by: engine at 9:23 am (utc) on Mar 24, 2021]
[edit reason] Please use example.com [/edit]