I am running sta-A and site-b on same installation. I have cookie set for domain and have htaccess with CORS origin set to allow *, and also updated the nginx config to allow CORs. I know this last one works as font-awesome was blocked and is now working once i had updated the local nginx conf file.
The second domain only has live preview available on its home page. Any other entries created for the second domain have the link icon in the entries list in CP but when editing have no live preview option.
I thought 3.1.7 tokenized this?