COD Black Ops Cold War beta code: DZGM-1Y4WN-FJMF
Follow these steps to redeem your access code:
Login to your Call of Duty account or create one by following the directions provided.
Once logged in, enter your access code, select your gaming platform of choice and click 'Submit'.
Activision will send you an email with a platform-specific code and instructions on how to redeem the Open Beta via the platform store.