Once a game is registered it can not be re registered. The game is locked to the user you used to register the game. You need to access the first account. If you can not login you may have to contact EA customer support to resolve that issue.
How to contact Customer Service/Game Advisors:
1 Click on the following link: https://help.ea.com/contact-us
2 Make sure you are logged in (top right corner)
3 Click on the blue button "Contact a Game Advisor"
4 Enter the name of your game or product (or "Origin" for account-related issues) and click "Find Solutions"
5 Select the type of issue and the platform you play on, and click on "Find Solutions".
6 Click on the blue button "I still need help" if the FAQ articles do not apply to your situation.
7 Select a contact option. Note that you may get different contact options depending on your country.
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