If you're playing on Xbox or PlayStation, then this error usually appears when there is an issue contacting SnowRunner's servers. The console may be offline, or you may have lost connection to the internet. If you've checked this and are still seeing a 401 error on the console version, then please contact the game's developers by visiting https://support.saber.games/hc/en-us/categories/6056441571345-SnowRunner