I modified the addition code so that the format of the map link sitemap_index.xml becomes sitemap.xml and the problem has been solved. Does this affect the addition in any way?
https://www.telefonreview.com/sitemap.xml
I was using your plugins on WordPress but I am trying another company since your response is delayed.
But the link /sitemap_index.xml?yoast-sitemap=1 works and reads all files.
