The Marker Plus does not seem to connect with the Quarry Plus as shown in the screenshot. Or else I am doing something wrong. I used your tutorial as a reference

Version

• Minecraft: 1.16.1
• Single Player or Multi Player?: Both. I first discovered this playing ATM6 on our server, then decided to test in a local SP world.
• Forge: 1.16.1-32.0.75
• This mod (QuarryPlus): v16.0.5
• Other mods: JEI for testing only

See https://github.com/Kotori316/QuarryPlus/wiki/MarkerPlus
Also, place machine next to marker block. In your picture, it seems you placed machine at the edge of area with no marker block.

That worked! Thanks! Might I suggest you add a screenshot showing the machine in the proper location.