[2020] Can't run two Siege's intances in same PC(even using two separate accounts.)

I tried everything; Sandboxie, virtual machines and different Windows user accounts.

I am able to launch two Uplay launchers at the same time logged on different accounts,
but when i try to launch two Siege's instances at the same time, one of the two Siege's intances will close.

Both Siege's copies are legit, of course. I Just wanna play Terrorist Hunt with my friend on the same PC.