xConnect facet value persistence in multisite, when trying to open both sites in the same window but diff tabs

Question

I have county-specific multisite and configured correctly in site settings, As mentioned below.

Secondly, on the home page, I'm using some contact from the custom facet, and the source of data is site-specific,

The issue is when I open AU site, I can see data from the xConnect (Au Site), but when I open NZ site in the same tab, It's showing data from AU data source.

It's working fine If I open in a new window or in the incognito mode (Au site will show AU xConnect data, and NZ site will show NZ xConnect data), do I need to configure DNS or something else?

If anyone found a similar issue, I will appreciate if you can share your finding.

Answer 1

After a bit of investigation, I have found the solution this is because of missing separate domain for multisite, Sitecore relies on cookies to track anonymous contacts - specifically the SC_ANALYTICS_GLOBAL_COOKIE cookie.

If you have a single domain and want to keep multiple sites with the diff virtual folders, this issue will occur, In that case, You can configure the domain of the tracking cookie (SC_ANALYTICS_GLOBAL_COOKIE) if you do not want it to be the default domain, As mentioned here - https://doc.sitecore.com/developers/90/platform-administration-and-architecture/en/configure-the-analytics-cookie-domain.html