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What to do if you receive an error that your code is already claimed in your account.
Troubleshooting steps for problems installing or patching Hearthstone on mobile devices
Information about seeing the message "your accounts are being prepared for migration" with no change occurring to the account.
If you do not have a decryption key, check the installation instructions for a point of contact.
What to do if you cannot access your Hearthstone game progress on a mobile device
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.
What to do if the verification code received via SMS doesn't work
Information about an error in Diablo Immortal to free up some space to download additional data.