MX Simulator

i`m having a problem where i play the normal game and its all fine but when i go to play online with my friends it says key invalid, ive got latest snapshot and deleted normal mx.exe and replaced it with the 2018 snapshot. someone please help

You might have a typo in the key. The in-game check is just a simple checksum so it's possible to get a false positive when you have a typo.