You can only use the command start twice in between actually putting the key in and turning it to the run position. After the key is turned off you can command start twice then you need to put the key in. Here an insert from page 28 of your owners manual:
The engine can be started two consecutive times (two
15-minute cycles) with the RKE transmitter. However,
the ignition switch must be cycled to the ON/RUN
position before you can repeat the start sequence for a
Maybe this is the problem???