Apple has seeded the second developer betas of iOS 16.4, iPadOS 16.4, tvOS 16.4, and watchOS 9.4 for testing.
Also, starting with iOS 16.4 and the other releases, users will no longer install profiles to control beta access. Instead, devices must be registered to the Apple ID for beta updates to show up in Settings.
AppleInsider and Apple strongly advise users don’t install beta operating systems, or beta software in general, on to “mission-critical” or primary devices, as there is the chance of issues that could result in the loss of data. Testers should instead use secondary or non-essential hardware and ensure they have sufficient backups of their critical data at all times.