Verify Sitemap with Google webmaster?

Hello,
I’m having problems getting Google to verify my blog’s (self hosted on godaddy) sitemap. I think I know the reason. If I type in https://www.2photographersandadog.com in the address bar, when it goes to my site, it shows up as https://2photographersandadog.com (no www.) All of my sitemap’s links are https://2photographersandadog.com/sitemap/…. BUT google is looking for https://www.2photographersandadog.com.sitemap.xml… SO I think the missing www. is causing the problem. How to fix??? I have had my site verified with Google webmaster. Any thoughts? WHat am I missing?

Thanks!

Sam