Apple today seeded the first beta of an upcoming macOS Monterey 12.4 update to developers for testing purposes, with the new update coming three weeks after the release of macOS Monterey 12.3, which introduced support for Universal Control.
Registered developers can download the beta through the Apple Developer Center and after the appropriate profile is installed, betas will be available through the Software Update mechanism in System Preferences.
According to Apple’s release notes, Universal Control in the new iPadOS 15.5 and macOS Monterey 12.4 updates is not compatible with machines running macOS 12.3 or iPadOS 15.4, so Apple suggests that as a workaround, users should update their Universal Control devices to the new betas.
Read more at MacRumors.com