I could login ea account that is connected with my fc mobile

I have my fc mobile account that is liked with an unknown ea account i can log in my fc mobile with my facebook but can't know that which ea account my fc mobile is connected with because of which I'm not able to redeem the reward through redeem code My fc mobile account ID is "snip" and I want to link this accounts progress with another ea account whose ea I'd is 

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(CM: Edited to remove User ID. Keep it secret, keep it safe! 🧙‍♂️)