Php REST API SkypeBot建议的操作

正在尝试使REST API skype bot生效，但建议的操作消息出现问题。 我用如下代码准备JSON：

$message = [
        "type" => "message",
        "from" => [
            "id" => $clientid,
        ],
        "conversation" => [
            "id" => $chatid,
        ],
        "recipient" => [
          "id" => $chatid,
        ],
        "text" => "Color",
        "inputHint" => "expectingInput",
        "suggestedActions" => [
            "to" => [ $reptoid ],
            "actions" => [
                [
                    "type" => "imBack",
                    "title" => "Blue",
                    "value" => "Blue"
                ],
                [
                    "type" => "imBack",
                    "title" => "Green",
                    "value" => "Green"
                ],
            ],
        ],
        "replyToId" => $replyid
    ];

发送后，我只收到skype文本，没有任何按钮。 我在写什么？

基于，似乎Skype中的

建议操作

仅在卡的上下文中可用