Passenger Door Sill Rattle

[H3.007]

Has anyone experienced a rattle near their H3's passenger door? The rattle in mine is eminating from under the plastic sill cover and it almost sounds like a loose nut or pebble inside, sliding back and forth during hard braking and acceleration. How does the plate detach from the metal portion of the seal? Perhaps I can locate the item making the noise to let everyone know in the event this is a common, unresolved issue.