Go To: https://xyz.a.com/

Run This Code in browser Console:

var visitor = Visitor.getInstance(“F5237FF9@AdobeOrg”);

destinationURLWithVisitorIDs = visitor.appendVisitorIDsTo(“https://xyz.newloanapp.com/apply”);

window.location = destinationURLWithVisitorIDs;

Takes me to https://xyz.newloanapp.com/apply with the appended MCID data.

_satellite.getVisitorId().getMarketingCloudVisitorID(); on both the https://xyz.a.com/ and https://xyz.newloanapp.com domainsto check if that match