Sitemap - Domain Mapping - still shows subdomain

I've seen this asked but never really saw how to resolve it.

My xml sitemaps are being generated showing the subdomains instead of the mapped domains. instead of

I tried using both Infinite SEO and Simple sitemaps with infinite sitemap disabled and simple installed per instructions

I updated and added posts but it didn't change the xml sitemap. I'm not sure there is an actual sitemap to delete, isn't it dynamically generated?

Please advise this is killing projects.