Apple recently released an update Rapid Security Response for all the devices iPad si iPhone cu iPadOS 16.4.1 si iOS 16.4.1. The update that should solve a major security problem, I think came with a bug. Unable to Verify Security Response.
The problem is that the message appears after the update is downloaded, and the Internet connection works without problems. Both Wi-Fi and the 4G or 5G mobile network.
Unable to Verify Security Response
iPadOS Security Response 16.4.1 (a) failed verification because you are no longer connected to the Internet.
Unable to Verify Security Response
iOS Security Response 16.4.1 (a) failed verification because you are no longer connected to the Internet.
If seeing the notification in red (badge) on "Settings", most likely you have to wait until Apple will come with another update that will solve this problem.
Most likely, it is a Rapid Security Response which contains a bug. I don't know if the problem is global or on all devices, but I can confirm for it iPad Pro (4th gen.), iPhone 14 Pro si iPhone 13 Pro.