Yeah and just to be clear, the sitemap is something different. There's the locations.kml file then there's something in the sitemap to point Google to the KML file. Personally I use a file titled geositemap.xml, but others may just add the KML file location to the regular sitemap.xml or whatever they've titled it. It doesn't matter.
When you used the word press KML generator, did it output any info to you? Did you have to download the file or did it provide a link to view the file? As was mentioned, it is usually in the form of www.yourdomain.com/locations.kml where you replace "yourdomain" with your actual site url.
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