Apple updates iPhone SE 2020 to iOS version 13.4.1 just in time for its market debut which, we recall, was set for April 24 today. This is not a completely new update, as it had previously been released for the other iPhone models together with iPadOS 13.4.1. In essence, the bug has been corrected where it is not possible to participate in FaceTime calls with devices equipped with the operating system iOS 9.3.6 (and earlier) and OS X El Capitan 10.11.6.
So if you have already ordered an iPhone SE or intend to buy it in the next few days, check in Settings that the operating system is updated to iOS 13.4.1.
(update April 24, 2020, 12:22 pm)