In addition to MaxSpeakerLabels, can you also set the ShowSpeakerLabels parameter to true value? Please check the speaker diarization page and the complete set of StartTranscriptionJob parameters. To go faster with the troubleshooting you can also try to test your audio files from the Amazon Transcribe console. Hope this helps.
Speaker diazization- https://docs.aws.amazon.com/transcribe/latest/dg/diarization.html
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