Sign in to https://account.adobe.com/activated-devices.
Issue
When you try to activate Acrobat by signing in on a third device, Acrobat displays an error "Sorry something went wrong" instead of the "You've reached your device activation limit. Sign out of one of the devices below to continue" dialog.
Solution
Workaround 1: Log in to your Adobe account to sign out of Acrobat on your active devices
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In the list of Activated devices, select Deactivate.
Deactivate a device from your Adobe account Deactivate a device from your Adobe account To activate a device again, simply launch Acrobat from that computer. You should be prompted to sign in. If not, choose Help > Sign In.
Workaround 2: Create a feature lockdown registry key
Applicable to Windows
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In Start > Search, type RegEdit and press Enter.
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In the Registry Editor, navigate to the following path: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Adobe Acrobat\DC\FeatureLockDown.
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Create the following key:
Key: iNGLCEFWorkflowEnabled
Data type: REG_DWORD
Value: 2
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Close the Registry Editor.