WhatsApp 打开方式测试

In-app browser: TikTok / IG / FB / WeChat / LINE WebViews may block custom schemes entirely or only allow https navigation.
System browser: only Safari / Chrome really hand off to WhatsApp universal links. x-safari-https:// is mainly an iOS Chrome private scheme; other browsers ignore it.
WhatsApp universal link: https://wa.me/&lt;number&gt; is the official entry point.
App + number: not installed, invalid number, or blocked by policy all look like \"nothing happened\".

把客户实际收到的链接（wa.me/message/…、chat.whatsapp.com/…、你们的落地页…）粘进来，用不同方式逐个打开，判断断在哪一层。