To identify user across cross-domains in at.js 2.x, probably, you can
try the below approach.You can try passing the ECID as a query parameter
in the URL. Let's consider the scenario as A as your site1.com and B as
your site2.comFirst, fetch the ECID on AThen, update the navigation
link/href (which redirects to B) on A by including the ECID mentioned in
point1.At last, get the ECID from URL on B and overwrite the one
available on this page. Thanks!