The error code 4975 occurs when linking a Steam account to an EA account while launching an EA game through Steam.
This error indicates that EA's authentication servers have rejected the linking request due to security or eligibility issues.
EA's authentication tokens can expire or become mismatched with the current Steam session if they haven’t been refreshed recently.
This results in EA's servers rejecting the linking request due to an invalid token.
Author's summary: Fix EA error 4975 by checking account links and settings.