Hi there friends,
I know that this error is not a fun thing to deal with and hope we can get each of you back in. This error happens from time to time and we have a few threads on this. The most recent one here does have some fixes that help for others, I would check it out and feel free to post back here. Warzone BLZBNTAGT00000960 error won't update - #2 by Joynueer
We only want to get you in and playing. I hope that thread helps. 
/Nathardrick