Hard to say what the cause it without actually looking at your scene, and how you've configured it. When you look at the scene, does the character controller intersect properly with it? Have you rotated the tilemap with it lying on the XZ plane instead of the default XY?
I can say for certain that it does work. If you can, send me a a simple repro project to look at (support at unikronsoftware.com), that might be the best way to solve this. If not, let me know and I'll see if I can find one of the demos I developed for this ages ago.