https://wccftech.com/ios-12-4-beta-2-released-to-developers-for-testing-purposes/

Today, Apple has seen fit to release the second beta of its forthcoming iOS 12.4 to developers. The new build arrives a week after the company seeded the first beta and two weeks after iOS 12.3 was released to the general public. If you’re interested, the latest iOS 12.4 beta 2 is now available to install through the Apple Developer Center. Let’s dive in to see some more details on the new build and whether it possesses any forward-facing addition.

If you’re a registered developer, you can download iOS 12.4 beta 2 from the Apple Developer Center or via the over-the-air mechanism. However, be sure to note that a proper configuration profile is required which will be installed through the Developer Center.