I am scanning a customer's ticket, but it is saying it is invalid. Why?

I am scanning a customer's ticket, but it is saying it is invalid. Why?

There are a number of reasons that this may occur:
  1. It is not an EventsPass ticket (see here View or edit the details of an individual transaction)
  2. The ticket is not valid for use on the current day (please familiarise yourself with 'TICKET VALIDITY settings on each ticket)
  3. The ticket has already used up the available quota of 'visit' scans on the current day/event (please familiarise yourself with 'TICKET VALIDITY settings on each ticket)
  4. The ticket is not valid for entry at the current scanning location (set on the CheckIn device you are using)
  5. Your scanning device lost internet connectivity, and the customer purchased the ticket after the device lost internet (re-connect to the internet to resolve).
  6. The CheckIn app is using the incorrect scanning mode (see here).
See next: On-Site Troubleshooting Guide: The Check-In App