Got 502 bad gateway in batch mode with tts model

Gemini API
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1

Is anyone else also using a TTS model with batch mode?

I’ve tried many times and keep getting a 502 Bad Gateway error.
I was wondering, does the current batch API not support TTS models yet?

Here is my code

client.batches.create(
        model="gemini-2.5-flash-preview-tts",
        src=[types.InlinedRequest(
        contents=[types.Content(
            role="user",
            parts=[
                types.Part.from_text(text="""
Read aloud in a warm, welcoming tone
Speaker 1: Hello! We're excited to show you our native speech capabilities
Speaker 2: Where you can direct a voice, create realistic dialog, and so much more. Edit these placeholders to get started."""),
            ],
        )],
        config=types.GenerateContentConfig(
            temperature=1,
            response_modalities=[
                "AUDIO",
            ],
            speech_config=types.SpeechConfig(
                multi_speaker_voice_config=types.MultiSpeakerVoiceConfig(
                    speaker_voice_configs=[
                        types.SpeakerVoiceConfig(
                            speaker="Speaker 1",
                            voice_config=types.VoiceConfig(
                                prebuilt_voice_config=types.PrebuiltVoiceConfig(
                                    voice_name="Zephyr"
                                )
                            ),
                        ),
                        types.SpeakerVoiceConfig(
                            speaker="Speaker 2",
                            voice_config=types.VoiceConfig(
                                prebuilt_voice_config=types.PrebuiltVoiceConfig(
                                    voice_name="Puck"
                                )
                            )
                        )
                    ]
                )
            )
        )
    )]
)

The error I got

502 Bad Gateway. {'message': '<!DOCTYPE html>\n<html lang=en>\n  <meta charset=utf-8>\n  <meta name=viewport content="initial-scale=1, minimum-scale=1, width=device-width">\n  <title>Error 502 (Server Error)!!1</title>\n  <style>\n    *{margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px}* > body{background:url(//www.google.com/images/errors/robot.png) 100% 5px no-repeat;padding-right:205px}p{margin:11px 0 22px;overflow:hidden}ins{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:none;padding-right:0}}#logo{background:url(//www.google.com/images/branding/googlelogo/1x/googlelogo_color_150x54dp.png) no-repeat;margin-left:-5px}@media only screen and (min-resolution:192dpi){#logo{background:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) no-repeat 0% 0%/100% 100%;-moz-border-image:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) 0}}@media only screen and (-webkit-min-device-pixel-ratio:2){#logo{background:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) no-repeat;-webkit-background-size:100% 100%}}#logo{display:inline-block;height:54px;width:150px}\n  </style>\n  <a href=//www.google.com/><span id=logo aria-label=Google></span></a>\n  <p><b>502.</b> <ins>That’s an error.</ins>\n  <p>The server encountered a temporary error and could not complete your request.<p>Please try again in 30 seconds.  <ins>That’s all we know.</ins>\n', 'status': 'Bad Gateway'}