What bike do you have this in? What model crank is this?

I'm not sure removing the 2mm spacer will give you enough.

Do you see that stopper plate sticking out from between the gap where the pinch bolts are? That should be able to be pushed in when the crank arm is on the spindle far enough. But it's so far off the spindle right now, you might actually get a false positive.

Road crankset in a mountain bike is very likely your issue. Road bikes typically have a narrower BB shell and therefore a shorter spindle. And I think the mtn bike BB's also set the overall distance different in a road shell than would road bike BB in a road shell.