Mendix’s Google Analytics Add-On only works with a Universal Analytics tag, which Google Analytics does not provide users with by default anymore. In order to resolve this, when setting up your GA Dashboard, click “Show Advanced Options” under the “Property Setup” heading and there will be an option to receive a Universal Analytics tag. Make sure when you do this, you select the option to ONLY receive a Universal Analytics tag, or else you will still receive a G-xxx tag. Once you have your UA tag, simply enter it into Mendix and your website data should transmit to your GA dashboard.