Failed bookings can be caused by a variety of reasons. Here are the most common ones:
Incorrect configurations: the device may not be configured correctly in the PORTAL. Double-check your device configuration and venue settings.
Service outages: there may be a service outage with your dispatch system.
No internet connection: sometimes, your device may lost connection to the internet and therefore create failed trips. Try resetting your device or moving it so it has a stronger connection.