Can't make Bevel Modifier working on engraved mesh I'm trying to bevel the mesh with bevel modifier, for the text area marked red, but the modifier doesn't work,

Even if I apply the bevel modifier on the whole mesh in object mode, it doesn't work either,

I don't know what goes wrong, what I want to achieve is to bevel the engraved text area, to make it smooth.
Turn off the “clamp overlap” in the modifier. This has gotten me a few times too.