We are looking into any ongoing or recent issues with no sound playing with iOS or iPadOS push notification reminders. In these instances, users are receiving push notifications for task reminders, but they do not play the sound.
If you are affected, please try playing the sound in the app's Settings—it should play out loud on that screen, which helps rule out other problems on the device.
This seems to be very specific to certain accounts, so if you are affected and adjusting it doesn't help, please contact us so we can make sure they are working for you as well: