@Liberty_Valance Make sure at least one BLUFOR enters the grid listed in the briefing. This grid is a good spot to setup the ambush. Even if you choose to setup elsewhere, at least enter it to activate a trigger that will eventually move the convoy. There is sufficient time to get your team setup before they move. There will be some wait time.

the convoy never moves

A couple of tips:
1- The scroll menu commands apply to all squads, including the ones under High Command.
2- At least one BLUFOR must enter the grid referenced in the briefing or the convoy will not depart.
3- Once your platoon is set for the ambush, place them in "STEALTH" mode using the scroll wheel and they will mostly go prone. You might want to wait until set, or they may move too slow. Follow that up with a hold fire from the scroll wheel and wait for your moment to "GO LOUD!".
4- Use demo, and vary it, or just "GO LOUD!" when the time is right. Change it every time you run this mission.
5- Vary where you place your platoon for the ambush. Try different sides of the road, or try an "L" formation.
6- Try not completing the ambush, and move to the second task. This should make that task tougher. However, a team member must at least enter the grid to launch the convoy.

Questions, just ask.

@Marc Thanks

Nice.