Error using SliceVectorPlot3D?

You may wish to try changing the option 3DRenderingEngine in the Option Inspector. I think you can also control this with style. eg
Style[SliceVectorPlot3D[{2 x, 2 y, 0}, {x^2 + y^2 - z == 0}, {x, -2, 2}, {y, -2, 2}, {z, -2, 2}],
RenderingOptions → {“3DRenderingEngine” → “OpenGL”}]

The choices vary by OS and their relative performance varies depending on your hardware.

What OS / Version are you using? Works fine on “12.3.0 for Mac OS X x86 (64-bit) (May 10, 2021)”.

SliceVectorPlot3D[{2 x, 2 y, 0}, {x^2 + y^2 - z == 0}, {x, -2, 2}, {y, -2, 2}, {z, -2, 2}]