Bevel on inner edge not working

I have two models.

Both are exported to .obj format from sketchup and then imported into blender.

When I try to bevel the inner edge of this part on the bad model, nothing happens:

But on the good model, when I try to bevel that same inner edge, I get bevels:

Why doesn’t the “bad” model allow me to bevel?

If you hide the top face you will see another face connected to the edges you want to bevel. Delete it