Teammates will share a single deck, drawing 2 per team like a standard game. Both teammates can work to score these objective e.g. if the objective “Cleanse” is drawn, 1 unit from each players army can attempt the action to try and score maximum points. 

Either player may spend 1 CP to cycle a mission card in the Command Phase but this can only be done once per command phase.  

Armies on each team are considered to be separate. So if an army needs to hold objectives or have a degree of board control for a benefit, it must be done with their own units. Teammates cannot assist with this.

If the quantity of tokens are based on the size of enemy armies (Such as Leagues of Votann Grudge Tokens) then a player will receive the amount they would receive for a 2000 point game but they must be split as evenly as possible between both the opponents armies. If there is an odd number the controlling player may choose which opponent to give the extra token to.

If the tokens depend on your army size (such as Aeldari Battle Focus) players will only receive the amount they would get in a 1000 point game.

Army rules, special rules, detachment rules, or stratagems that debuff an enemy, even those such as Death Guard Contagions that change the enemy datasheet characteristic, can not be taken advantage of by a player’s teammate. For example if a team has Death Guard and Space Marines and an enemy unit is within Contagion range, only the Death Guard units will benefit from the -1 toughness (and other debuff) on the enemy unit. The Space Marine attacks will be conducted as if the enemy was not in Contagion range.