https://wccftech.com/apple-releases-second-beta-of-watchos-6-1-2-macos-catalina-10-15-3-tvos-13-3-1-to-developers/

Today, Apple has seen fit to release the second beta of watchOS 6.1.2, macOS Catalina 10.15.3, and tvOS 13.3.1 to developers for testing purposes. If you're a developer and want to try out the latest beta builds, be sure to download them on your compatible devices. Let's dive in to see some more details on the beta builds.

If you're looking to install watchOS 6.1.2 beta 2 on your Apple Watch, make sure that an appropriate configuration profile is installed from the Developer Center. The second beta can be installed through the dedicated Apple Watch app on your iPhone by going to General > Software Update. Make sure the Apple Watch has more than 50 percent of battery life or placed on a charger.