I have started a bounty on this question, it is about ten minutes that my bounty has ended; and I have received a message: $$\text{Your bounty on question} \\ \text{"Counting the Number of Integral Solutions to} \ x^2+dy^2=n" \\ \text{is completed.} \\ \text{You must award it to an answer within 24 hours}.$$
Note that each of the answer to that question exists before I start a bounty on it; and none of them satisfies me. Does the term must means that there is a force to award this bounty on one of the existing answers?
Note that long time ago, I have shown my interest on this special problem; as you could see here, and after ending this bounty I will increase the amount of bounty on the same question.