Hello,
I apologize for the issue you are facing with Google Search Console not being able to fetch your sitemap after changing your domain. Here are some steps you can follow to troubleshoot and resolve this issue:
1. Validate Your Sitemap
First, ensure that your sitemap is correctly configured. You can validate your sitemap using the Validate XML Sitemap tool. Enter your sitemap URL and click VALIDATE SITEMAP. If there are no issues, it should return a success message.
2. Ensure the Sitemap is Located in the Root Folder
Make sure your sitemap is located in the root folder of your new domain. The correct URL should look like this:
https://support.rankmath.com
3. Check Your Site’s Indexing Settings
Ensure that your posts are set to index. Go to Rank Math SEO → Titles & Meta and check the Robots Meta settings. Make sure the Index checkbox is enabled for your posts.

4. Flush the Cache
If your sitemap appears outdated, you may need to flush the cache. Navigate to Rank Math SEO → Sitemap Settings, increase the value of Links Per Sitemap by one, and then save your settings. After that, go to Settings → Permalinks and click Save Changes to ensure the current settings are applied.

5. Add the Correct Site URL to Google Search Console
Make sure you have added the correct version of your new domain to Google Search Console. You can refer to this article on adding a URL property to the Search Console.
6. Resubmit Your Sitemap
After ensuring everything is set up correctly, go back to Google Search Console, navigate to Indexing → Sitemaps, and resubmit your sitemap URL:
https://support.rankmath.com
If you continue to experience issues, it may be beneficial to consider our professional setup service, which ensures that your plugin setup is fully correct and adheres to the latest SEO standards. You can find more information about this service at Rank Math Professional Setup Service. Please note that this service requires a PRO subscription.
If you have any further questions or need additional assistance, feel free to reply to this ticket, and a human agent from our support team will assist you further.
Sources:
Troubleshooting the “Couldn’t Fetch” Error in Google Search Console » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.