Reaction force probe boundary conditions

[jstaha]

I am running a random vibration analysis on an aluminum box with eight mounting feet (image attached), and am trying to find the reaction forces at the mounting (boundary) locations. The box has displacement constraints on the circular edges at each mounting foot (grouped as the named section "Holes"), simulating it being bolted to a surface. I've run the analysis to show an equivalent stress plot, which works fine. But when I insert the force reaction probe and attempt to name boundary condition, I am given no boundary condition options to choose to apply the probe. Am I going about this the wrong way, or is there an issue with how I've defined the constraints that won't allow me to run the force reaction probe?