Reply To: Transitioning _setDomainName from legacy to Google Analytics 4: Need guidance

[Michael]

In Google Analytics 4, you can’t directly substitute _gaq.push(['_setDomainName', '']) as this belongs to the old Universal Analytics tag method. The domain setting is managed by “cookie_domain” which auto-configures itself in the gtag setup. When you migrate to GA4, you are shifting to an event-based model and much of the configuration that was done in code in Universal Analytics is now handled in the GA user interface. Also, domain configuration is generally handled automatically in gtag.js, the library used in GA4. If you see an error from gtag('_setDomainName', ''); it’s because this command is not valid in GA4. You should remove it from your GA4 scripts because it is not necessary. The error occurs because GA4 does not support the ‘_setDomainName’ command.