RSS Feed URL not working

Hi all, Actually I’m facing a problem related to the RSS feed URL of my site Top Travel Advice. I want to add a Feed URL in google News when I view the page sources and view the Feed URL it shows this URL https://toptraveladvice.com/feed/ but when I add the URL it fetches no data. I checked this URL if it shows the XML sitemap or not. but it shows the XML file and looks fine.

But when I check this URL on w3 feed Validator (https://validator.w3.org/feed/check.cgi?url=https%3A%2F%2Ftoptraveladvice.com%2Ffeed) it shows the error that it is incorrect and where I place this feed URL it fetches no data. I really can’t understand what the issue with. Can anyone please help me to solve this issue?

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