www version of the sitemap page is empty, causing google to ignore it

Yes mine is doing that too, would appreciate some help on that. My site https://www.zebravision.com.au.

Anyone?

Why the XML sitemap is not showing when you use https://www.ultralitetrailer.com/sitemap_index.xml

But it shows with https://ultralitetrailer.com/sitemap_index.xml

Google automatically trims it and makes it to be www.

If that will not be solved then what use do I have to have that enabled with the plugin when Google is going to ignore it anyway? it still says pending.

You might have to create a post processing rule for the non www. version

The non www version works aka https:// but not the www.
Can you give me an example what is that post processing rule is?

The site is hosted on Godaddy Managed wordpress server.

The error message is that when I type in https://www.accessrvrental.com/sitemap_index.xml

sitemap_index.xml:1 Unsafe attempt to load URL https://accessrvrental.com/main-sitemap.xsl from frame with URL https://www.accessrvrental.com/sitemap_index.xml. Domains, protocols and ports must match.