In many cases, when I submit multiple simulations or a multi-port FDTD simulation, the first simulation runs through while the rest fail.
By default, Sim4Life tries to use all available resources to start as many simulations as you submit or have cores or GPUs available. The first simulation usually starts fine, and the rest fail due to insufficient licenses.
You have the option to limit the number of simultaneous simulations in the ARES tool. Please change the Resource Management Option from Concurrent Jobs to One Job at a time as in the attached screenshot.