Wrong ID ?!

you told me if i want to change my Security i have to go to account -> account administration and i did that and wrote every thing correct but i have a problem !! every time i write my ID it tells me its wrong and i need to know why it tells me wrong ID ( I checked it like 20 times and i know its correct and if it wasnt correct i wouldnt type here ) so please i need someone to help me :(

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