That’s great that it now connects. Odd… but let’s take it as a win.
As far as it not marking the material I suspect your speed is just way too high. There are really only 3 factors in a burn: focus, speed, and power. Assuming your focus is good and your power is already at 100% then reduce speed.
On a different note, you may want to read this post about power levels and diode degradation.