Thanks for your response. Regardless of the hreflang tag, which I understand how that works, I have seperate sites for seperate countries which may or may not have different content per site. Not everything needs to be the same on every site.
So the point is, RM does not pick up nor generate ANY content from the other Multi Domains from PolyLang.
In a standard polylang setup where langs are in subdirectories, this is not a problem.
I have not even started talking about the other multilingual issues.
Furthermore, you should know that google treats each website as its own. So it would make logical sense to publish a site map per site.