Reminders app doesn’t work on brand new iPhone 13 Pro

So I’ve just switched to iOS from Android recently and I’m having difficulties with the Reminders app.

I ask Siri to set a reminder, they are displayed in the Reminders app correctly, but when the time comes, there is no push notification or sound at all. Going into the app displays them as overdue.

What’s the deal? I haven’t messed with the settings for anything. I’ve tried several fixes including turning them off and on for iCloud, restarting my phone, making sure the notifications are on etc.