Oh, hang on – I do now.

Was getting a big fat 404 earlier.

@Edent

According to this WP should just generate a sitemap automatically.

Building A Sitemap For A Site | Learn WordPress

Build a sitemap for a WordPress website

Learn WordPress (learn.wordpress.org)

I can't test on the WP blog I run because we use Yoast which hijacks the URL. But on your blog /wp-sitemap.xml returns a 404.

In true web dev style I'm going to suggest purge your caches / could be a DNS issue ...

@Edent