That PHP calls KinesisVideoSignalingChannelsClient getIceServerConfig doesn't return IceServerList.

Using PHP to call KinesisVideoClient describeSignalingChannel can return ChannelARN successful, but call KinesisVideoSignalingChannelsClient getIceServerConfig doesn't return IceServerList.

Aws\Result Object (

[data:Aws\Result:private] => Array
    (
        [@metadata] => Array
            (
                [statusCode] => 200
                [effectiveUri] => https://kinesisvideo.ap-northeast-1.amazonaws.com/v1/get-ice-server-config
                [headers] => Array
                    (
                        [x-amzn-requestid] => 0e909c15-4a9b-4a95-868b-f27ea3a4dc8a
                        [content-type] => application/json
                        [content-length] => 90
                        [date] => Thu, 24 Feb 2022 06:01:18 GMT
                    )
                [transferStats] => Array
                    (
                        [http] => Array
                            (
                                [0] => Array
                                    (
                                    )
                            )
                    )
            )
    )
[monitoringEvents:Aws\Result:private] => Array
    (
    )

)

my source code :

$credentials = new Credentials( 'id', 'password' );

$kvClient = new KinesisVideoClient([ 'region' => 'ap-northeast-1', 'version' => 'latest', 'credentials' => $credentials ]);

$describeSignalingChannelResponse = $kvClient->describeSignalingChannel([ 'ChannelName' => 'stream1', ]);

$channelARN = $describeSignalingChannelResponse['ChannelInfo']['ChannelARN'];

$kvscClient = new KinesisVideoSignalingChannelsClient([ 'region' => 'ap-northeast-1', 'version' => 'latest', 'credentials' => $credentials ]);

$getIceServerConfigResponse = $kvscClient->getIceServerConfig([ 'ChannelARN' => $channelARN ]);