# Why is the appointment flash sale button grayed out and unclickable?

<div data-elink-language-switch="1" id="bkmrk-%E4%B8%AD%E6%96%87" style="border:1px solid #d6d9de;border-radius:6px;padding:10px 12px;margin:0 0 18px 0;background:#f8fafc;font-size:14px;">[中文](/books/2b24d/page/65ded)</div><span style="font-family:'Microsoft YaHei', '微软雅黑';white-space:pre-wrap;background-color:rgb(255,255,255);font-size:14px;">You need to enable preheating before enabling reservations, and the reservation function requires binding to a verified service Official Account to use.</span>