Hi there! The error message means that some of your default keys have the wrong indentation level. In push_category and notification_message the default key should be a direct property of the variable object, like this:
notification_message:
name: Notification message
description: The message to send as a reminder in the notification
selector:
text:
default: "🔑 It's 8pm and the Car is still open!!"
It looks like you already did this correctly with time_condition