One of the only other ways to get a Diablo 4 early access beta code is to pre-purchase the game. Buying a chicken sandwich is much cheaper.
KFC Gives Away Diablo 4 Access Codes for A Double Down – PlayerAuctions Blog
Diablo 4 open beta - How to redeem early access code?
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How to get the KFC Diablo 4 beta early access
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You can get Diablo 4 early beta code by buying a KFC sandwich (US only), Page 2
How to Get Early Access to Diablo 4 Beta