Place it immediately after the question in your edit, then follow it with the Ceeday Huh sound for a second beat before the Wrong Answer Game Show sound closes the moment with a clear fail.
About this sound
This is a half-second human vocalisation built around a drawn-out, uncertain 'uhhhh' and a mumbled 'I don't know'. The voice sounds caught off guard, as if the speaker was asked something and had no answer ready. It feels awkward and sheepish, with a dry, self-aware humour that makes a blank moment funnier instead of tense.