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Please, people, it's not useful to write that you marked something that was right, and the software said it was wrong.
1- We cannot see what other people wrote. So, you have to tell us. We cannot guess.
2- It happens we make typo without noticing it, so cut & paste your answer to make sure it was exactly what you typed.
3- The given instructions change sometimes, we have to translate to Spanish, or to English, or to hear and write Spanish... and sometimes we write in the bad language. So double check the instructions.
4- You cannot report errors here, they won't read. It's only the forum to get help from other users. If they forgot a good solution, please use the report button. And if it was a bug, take a screenshot to prove the bug.
No. it's not for something that ends with "a", but for feminine nouns.
Very often, feminine nouns ends with "a", but some feminine nouns are not with "a", and some nouns with "a" aren't feminine.
The rule never changes: "una" is for feminine nouns, and "un" for masculine nouns.
Masculine nouns don't all ends with "o" and all the nouns ending with "o" are not masculine. Most of the time, they are, but there are exceptions.