Why was 你要不要冰咖啡? not accepted? The verb pattern verb-不-verb should be accepted. Reported...

it should be accepted

I entered the exact answer and was marked incorrect

can you also say "你想要冰咖啡吗"? duolingo is throwing me through a loop with 想要 vs 想 vs 要

I didn't finish typing when it told me that it was incorrect. This is not the first time.