The entry delay notification is not loud enough and not persistent enough. One solution would be to add an Alexa skill, preferably with the option to have a loud tone sound repeatedly or continuously, and/or repeated voice announcements.
I’m also requesting this feature request. We should be able to have the entry delay notification warning played through all connected Alexa/Echo devices.
I just set the alarm off opening a door on the other side of my house not realizing my wife had set the alarm in the middle of the day and I didn’t hear the entry delay warning. I already have an Echo in every room with a Ring sensor. I shouldn’t have to buy a Ring keypad for all of those rooms just to hear the notification.