public void SubMessage(Action callback)
{
    var opt = new RequestSubscribeMessageOption();
    opt.fail =(result =>
    {
        D.Error($"订阅消息失败--  {result.errCode}----{result.errMsg}");
    });
    opt.success = result =>
    {
        D.Error("订阅消息chenggong");
    };
    opt.tmplIds = new[] {"UXdBiKWsBpmavR3VxSqtPkPfasQYESgZnW-n8ifLnro"};

    opt.complete = result =>
    {
        callback?.Invoke(true);
    };
    D.Error("发送订阅消息:"+  opt.tmplIds[0]);
    WX.RequestSubscribeMessage(opt);
}

最终返回失败 errcode:0; errMsg:fail require user interaction

AddListener(EventTriggerType.Click, m_SubBtn,
    (_, __) =>
    {
        
        SDKWXGameGroup.Instance.SubMessage((b =>
        {
            EventMgr.FireEvent(TEventType.SettingSubStateChange);
        }));
    });