i cant link my xbox acc to my ea

when i want to try to link in my xbox acc to this ea acc it keeps saying this wasnt planned but i know its bc there was another ea acc on that xbox acc so when i go to ea manage to see what acc is linked on my xbox it shows i have to sign in so i do it. and i have checked on every acc to see if its link to my xbox but none of them are so can anybody help me