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If you do not have a decryption key, check the installation instructions for a point of contact.
Blizzard support cannot assist with this error, please contact Activision Support.
How a friend can contact Customer Support when she/he can't log in.
If you have a regular version and want to register for the first edition, you need to contact customer support.
What to do if the verification code received via SMS doesn't work
Information on how to contact Blizzard Entertainment for any accessibility concerns with our games, support or products.
Custom text on Group Finder listings now require an Authenticator and Phone Notifications.
What to do if you cannot access your Hearthstone game progress on a mobile device
Information about an error in Diablo Immortal to free up some space to download additional data.