Sign in to Google Search Console.

In the sidebar, select your website.

Click on ‘Sitemaps’.

The ‘Sitemaps’ menu is under the ‘Index’ section. If you do not see ‘Sitemaps’, click on ‘Index’ to expand the section.
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Copy the sitemap URL
In the section Custom domain setup > Sitemap, copy the generated sitemap URL by clicking on the icon.
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Paste the copied URL in the ‘Add a new sitemap’ field to complete the sitemap URL.
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Click Submit.