ive successfully performed the 2v2 bug btw
step 1.
click battle and activate the beta button

step 2.
confirm that beta is on by going back to menu and back to the battle screen again

step 3.
have a friend not on beta invite you to gave

step 4.
pick any faction that isnt the faction you originally came with...

step 5.
1000 pt fleets in 600 pt battles

note that 1000 pt fleets seems to be a good counter to drukhari and the eldar meta.... had a run with it awhile ago and DE seems alot more balanced in these situations lol...