Possible explanations and actions:

• Movement detection is set incorrectly in the trip detector, e.g., the ignition sensor is out of operation or configured inproperly.
  

• If some filtration of intervals is selected in the reports template (by minimum mileage, by stops, etc.), those filters can weed out this trip. Clear the filters or correct them.
  

• The interval for data transmission which is set in the device is bigger than 'Minimum parking time' option set in the trip detector. Either configure the tracker to send data more often or increase minimum parking time value.
  

• Check other parameters of the trip detector.