In case it’s not clear yet from the explanations above, here’s an English equivalent:
Wanikani: How do you pronounce the letter ‘C’?
You: “s” (as in certain)
Wanikani: We’re looking for the other pronunciation (“k” as in captain)
Wanikani: How do you pronounce the word “CAT”:
You: “sat”
Wanikani: Sorry, that’s wrong.