Code Issue - Drawing Robot (Arduino Engineering Kit)

Using Arduino Project Guidance
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Kit: Arduino Engineering Kit Rev2
Project: Drawing Robot
File: Task2.mlx
Section: Draw on the whiteboard
Issue: Matlab app opens as expected, moving the sliders changes the parameters (mL.speed, mR.Speed, etc) successfully, but the DC motors do not move at all. The servo motor turns as expected, except that it has no neutral position, only left and right.
I can live with the servo motor only having 2 positions, but not being able to move the DC motors even though the tutorial claims the matlab app should work is haunting me.
I've tried controlling the motors in a custom script from the section right before, and the DC motors turn fine.
What would be the cause and the solution?

Thank you to anyone who can help me out

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You may get help faster if you treat this as an Arduino project that you want help with instead of a problem with a specific part of a specific Arduino kit.

Please read the forum guidelines to see what kind of information that we need to be able to help you, including code, a schematic, technical data for the components Including power supplies and photos showing the wiring.

Or post link(s) to where the above information can be located.

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