Could this also mean Andi likes a jacket or the jacket? Depending on the context
Having an article in front of 'jacket' is just as much of an assumption as the accepted answer which assumes 'jacket' is plural, "likes the jacket" or "likes a jacket" should be fine here because there is not enough context given to know the precise meaning.
Andi suka jaket is singular. To refuse a singular answer is incorrect. My answer Andi likes the jacket is singular. Duolingo. You need to update your Bahasa Indonesia database. Please Cepat cepat. Phil