It is possible to remove Server authorization and platform-specific services (such as Google Play or Game Center) from your account. 
To proceed further, it is required to verify you as the account owner.

Please submit your request below and specify the following information in your message:

• Approximate date and place of creation of the game account (country, city);
• Screenshots of the latest purchase confirmations (if any in-app purchases were made). These are usually available in the purchase history of your platform/service account. If that’s not possible, please provide any other relevant proof of payment.
• The device(s) used to play the game;
• Previous nicknames used on the account.