Hello,
We apologize for the issues you are facing with your sitemap and indexing. It sounds quite frustrating. Here are some steps you can take to troubleshoot the "Couldn’t fetch" error in Google Search Console:
1. Rename the Sitemap File
Sometimes, changing the name of the sitemap file can help. In Google Search Console, navigate to Indexing → Sitemaps and add a new sitemap using the following format:
https://yourdomain.com/?sitemap=1

2. Fix Sitemap Issues
- Validate Your Sitemap: Use the Validate XML Sitemap tool to check if your sitemap is correctly configured.

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Ensure the Sitemap is Located in the Root Folder: Make sure your sitemap is in the root folder of your WordPress installation, like this:
https://yourdomainname.com/sitemap_index.xml
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Check Post Indexing Settings: Ensure that your posts are set to index. Go to Rank Math SEO → Titles & Meta and enable the Index checkbox.

- Flush the Cache: Increase the value of Links Per Sitemap by one in Rank Math SEO → Sitemap Settings, then save changes. Also, go to Settings → Permalinks and click Save Changes.

3. Add the Correct Version of Your Sitemap to Google Search Console
Make sure you have added the correct URL variation of your site in Google Search Console. You can check this in your WordPress dashboard under Settings → General.

4. Check for Caching Issues
Ensure that your sitemap is not being cached by any caching plugins or server-side caching. You can refer to this article on ensuring that your sitemaps are excluded from caching.
5. Favicon Visibility on Google
For the favicon issue, ensure that it is correctly set up in your website’s settings and that it is accessible publicly.
6. Bing Indexing Issues
For Bing, if you are seeing "Discovered but Cannot Crawl," it may be due to similar issues with your sitemap or site accessibility. Ensure that your site is not blocking Bing’s crawlers and that your sitemap is submitted correctly.
If you continue to experience these issues after trying these steps, please reply to this ticket with your site URL so we can assist you further. A human agent will take over from there.
Thank you for raising this concern, and we hope these steps help resolve your issues!
Sources:
Troubleshooting the “Couldn’t Fetch” Error in Google Search Console » Rank Math
This is an automated reply from Rank Math Support Bot. Your ticket has been assigned to a human agent and we will get back to you shortly.
Hey there, we still cannot get Bing to process our pages and index them. On google only some of our pages are being indexed. Our important pages have not yet been indexed by Google even though they are discovered. What might be causing this? We have also tried using your Indexnow API but still Bing will not index them.
We launched this site last week. Is this a time thing and do we just need to wait it out?
Hello,
If a URL is on Google, there is technically no reason for it to not be included in Bing or other search engines, unless they have some reason to not index a page like DMCA, copyright content, nulled content, copied content, etc. which you can check in Webmaster Guidelines set by Bing.
Also, you should run the affected URL/s using the URL inspection tool of your GSC account to know their status.
You can also share the screenshot of the results here so we can check. You can upload screenshots using this tool and add the link here.
Looking forward to helping you.