Live transcription IdentifyLanguage not working

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What happened and what did you expect to happen?

I am trying to use Chime live transcription feature, but having an issue with enabling IdentifyLanguage.
Everything works fine if I specific LanguageCode: 'en-US', but when I do:

const transcribeResponse = await meetingClient.send(
                new StartMeetingTranscriptionCommand({
                    MeetingId: meetingId,
                    TranscriptionConfiguration: {
                        EngineTranscribeSettings: {
                            IdentifyLanguage: true,
                            PreferredLanguage: 'en-US'
                        }
                    }
                })
            );

I got a success message on the server side: transcribeResponse {"$metadata":{"httpStatusCode":200,"requestId":"b20b7f6e-07a1-4da4-a26e-86c89f7a3a5b","attempts":1,"totalRetryDelay":0}}

However, on the frontend, I got this error message:

Based on the documentation, seems like I don't need to specific LanguageCode when IdentifyLanguage is set to true:

Any idea about why this happens? Am I missing something? Thank you for helping in advance.

Have you reviewed our existing documentation?

• GitHub issues
• FAQs page
• README page
• Feature-specific guides

Reproduction steps

Server-side code:

const transcribeResponse = await meetingClient.send(
                new StartMeetingTranscriptionCommand({
                    MeetingId: meetingId,
                    TranscriptionConfiguration: {
                        EngineTranscribeSettings: {
                            // LanguageCode: 'en-US'
                            IdentifyLanguage: true,
                            PreferredLanguage: 'en-US'
                        }
                    }
                })
            );

Client-side code:

audioVideo.transcriptionController?.subscribeToTranscriptEvent((transcriptEvent) => {
            console.log('transcriptEvent', transcriptEvent);
            // do something with transcriptEvent
        });

Amazon Chime SDK for JavaScript version

3.535.0

What browsers are you seeing the problem on?

Chrome

Browser version

122.0.6261.129

Meeting and Attendee ID Information.

No response

Browser console logs

skip