Whilst I looked it up, and "koramikino" is correct, I would have expected the word to be "karamikino" since I would expect the root to be "kara–amiko–ino", that being like "love–friend–[female suffix]".
Perhaps the root of the word is actually different?
Many Audio files in duolingo provide improper pronunciation. Esperanto is a phonetic language yet some duolingo pronunciations have an English accent to it. My advice is to pronounce the words yourself using phonetic pronunciation rule. No one will be a pronounce nazi to you here. :)