1. 检查是否正确启用了Agora SDK，确保正确添加了库和框架。

2. 确保已将Agora SDK初始化为语音通话模式，代码示例如下：

let agoraKit = AgoraRtcEngineKit.sharedEngine(withAppId: appId, delegate: self)
agoraKit.setChannelProfile(.communication)
agoraKit.setDefaultAudioRouteToSpeakerphone(true)
agoraKit.enableVideo()

3. 检查是否正确设置了本地和远程视频视图。如果需要，可以使用以下代码示例设置视图：

// Setting video view for local and remote users.
let videoCanvas = AgoraRtcVideoCanvas()
videoCanvas.uid = 0
videoCanvas.view = localVideoView
videoCanvas.renderMode = .hidden
agoraKit.setupLocalVideo(videoCanvas)

let remoteVideoCanvas = AgoraRtcVideoCanvas()
remoteVideoCanvas.uid = remoteUid
remoteVideoCanvas.view = remoteVideoView
remoteVideoCanvas.renderMode = .hidden
agoraKit.setupRemoteVideo(remoteVideoCanvas)

4. 确保已正确实现了必要的代理方法，例如：

func rtcEngine(_ engine: AgoraRtcEngineKit, didJoinedOfUid uid: UInt, elapsed: Int) {
  // Handle remote user joined.
}

func rtcEngine(_ engine: AgoraRtcEngineKit, didOfflineOfUid uid: UInt, reason: AgoraUserOfflineReason) {
  // Handle remote user offline.
}

如果还是无法正常工作，可以查看控制台输出以获取更多信息。