Show notifications on lockscreen

My iPhone has always been in do not disturb mode. Before the most recent iOS update, to 15(.2.1), it used to be the case that notifications would show on my lockscreen. Now they never do. How can I get notifications to appear on my lockscreen again? To clarify, I would like the same behaviour I had before updating to iOS 15: - notifications pile up onto my lockscreen, but do not make sound or vibration - I never get any kind of pop-up notifications or alert sounds when I have unlocked and am using my phone