OBJ can't export with vertex colors

[Former user]

I'm able to export my model unless I add a color channel. The color channel contains all 1s. Specifically, an OBJ file is still created but it has only 1 vertex instead of 1572. My 1600 normals and UVs all export correctly.

Notably the single vertex that does export has only 3 color channels, so the alpha is missing.