I bought 1news.top 1month ago and redirected my blogger blogspot url to the new domain. when submitting sitemap for 1news.top/sitemap.xml then I am getting couldn't fetch status. It is working for blogspot url. I have done all kind of verfications but sitemap still showing status as couldn't fetch. Any help is appreciated. I can't see much about troubleshooting this issue.

Does the problem still persist? The file appears to be there when I check, so it sounds like an issue between your server and Google then. (Because if Google claims problem fetching the file, it has not even viewed/parsed the XML sitemap file yet.)