Activation keys are unique one-time-use codes. Once redeemed, they are permanently bound to your account and cannot be reused or transferred. Troubleshooting "Invalid Key" or Missing Files
If the game continues to ask for a key or says it is "already in use," try these official steps from Ubisoft Support: Anno 2070 Serial Number Key File
Copy the key to your clipboard to paste it into the Ubisoft prompt. For Ubisoft Connect Users: Open the desktop application. Click on your Library and select Anno 2070. Activation keys are unique one-time-use codes