Have you received this licensing error?
Operations error: 7131 Server activation is not allowed to activate entitlement line item: Make sure the license model is a server license model.
You may encounter this error if you attempt to activate a standalone license using flexsimserveractutil.exe on a license server.
A standalone license is intended to be activated directly within FlexSim Simulation Software installed on a client PC. Please see our instructions for standalone licensing for the procedures to use with your standalone FlexSim licenses.