ddpai's hardwiring kit doesn't work?

[Fraysa]

I've recently purchased ddpai mini2 which came with a hardwire kit as shown:

I have an Audi A7. I opened the side panel to access the fuse box, used a screw in grounding point for the ground and connected the red wire to a fuse with power even when the vehicle is off (I want the camera to record 24/7) after testing the fuse with a multimeter. However, when connecting to the camera it doesn't turn on. I'm 100% sure the fuse is giving power and that the ground point is correct. I tested the ground point with my multimeter as well as the fuse.

Any idea what could be wrong?

 

[Dknezevic]

Sometimes you need to remove the paint from the grounding point in order to make it solid. Can you test using alternative grounding point?

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[Fraysa]

I can confirm the grounding point is working because I used my multimeter and connected it to the exposed wire of the kit’s ground wire. I can confirm the fuse itself is okay because after connecting it the multimeter light also turned on.