You might be wondering why the sitemap status still appears to be ‘couldn’t fetch’ even after checking the sitemap’s availability through TEST LIVE URL in Google Search Console. However, the same sitemap was submitted to Bing Webmaster Tools, and it could be fetched properly.

You are not the only one facing this issue; many people are dealing with it as well. Some of them could get a ‘success’ outcome for sitemap status after trying out the suggestions they found on the internet.
You have tried the following methods. However, none of these works.
- Check the availability of the sitemap through TEST LIVE URL in Google Search Console.
- Add a slash ( / ) to the front of the sitemap URL.
- Add a slash ( / ) to the end of the sitemap URL.
- Check the format of the sitemap.
- Wait for the status to change after submitting the sitemap to Google Search Console.
Sitemap could not be fetched by Google Search Console
Following several attempts, Google Search Console could fetch our sitemaps within a few minutes. Therefore, it is actually not necessary to wait for several days until the status of the sitemap changes in Google Search Console.
So, what’s the problem? You need to check if you have hosted the website on the subdomain instead of the main domain (TLD). If it is hosted at the subdomain, this article might be useful for you.
In fact, Google Search Console does not accept the sitemap from the subdomain.
We have tried two scenarios. The sitemap URL from the subdomain was first submitted to Google Search Console, followed by the sitemap URL from the main domain. The results indicate that the sitemap URL from the subdomain could not be fetched, while the sitemap from the main domain was fetched successfully.

Potential Solution
What you can do is to map the main domain to the subdomain, so that the sitemap can be accessed on both main domain and subdomain.
Conclusion
Google Search Console does not accept the sitemap URL from the subdomain as Bing Webmaster Tools does.