A software update on July 19 shut off a lot of office computers, and the trucks still had to move.
Dispatch desks went dark. Some drivers could not open the portal they use for hours and messages. The freight did not care. A truck under a load still needs a destination.
Use the phone
Call the driver. Tell them where they are going, what time, and who to ask for. Send the rate confirmation from a phone if the system will not. Write the appointment on paper.
Do not leave a driver sitting because the screen is black. The computer comes back. A missed receiver does not.