https://wccftech.com/beta-2-of-ios-14-4-and-ipados-14-4-now-available-for-developers/

Apple has released the second beta of iOS 14.4 and iPadOS 14.4 to registered developers with iPhones and iPads. The update is available over the air.

You know the holiday season is officially over when Apple starts releasing beta software to developers and testers. Right now, you can go ahead and download the second beta of iOS 14.4 and iPadOS 14.4 over the air, provided you have the initial beta installed on your compatible iPhone or iPad.