Mobile app OS push notifications not being received

I have followed this guide: https://academy.creatio.com/docs/8.x/no-code-customization/bpm-tools/bpm-process-examples/set-up-push-notifications-for-mobile-users but I am not receiving iOS push notifications when these are sent. I can see the Creatio notifications are being sent, as they appear in the Creatio mobile app when going to the notifications tab, but I never receive any iOS push notifications.

I am using Creatio 8.3.1 and the latest iOS app version 8.3.5, and am on the latest iOS version of 26.1. I am logged into the Creatio mobile app when sending the notifications.