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Your agent doesn’t transcribe audio. It reads Google Meet’s live captions, which means Meet’s caption language decides what the agent hears. Set it wrong and the failure is quiet: Meet turns perfectly good speech into phonetic gibberish, and the agent answers the gibberish. It doesn’t go silent — it becomes confidently wrong, and nobody notices until someone reads the transcript.

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Set it before you talk

1

On first run

The setup wizard asks for your call language in the voice step. Pick the language your meetings actually happen in.
2

Per bot, any time

Each bot profile carries its own call language in App Settings, next to Voice. It’s applied when the bot joins.
3

Mid-call, by asking

The agent drives Meet’s own Settings dialog to change it, and tells you the language tag Meet actually settled on.

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What comes back

The agent reports the BCP-47 tag Meet applied — de-DE, es-MX, cmn-Hans-CN — not just “ok”. Worth reading, because a bare language can resolve to a regional variant you didn’t expect: If the exact regional variant matters, ask for it explicitly.

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Multilingual meetings

Meet captions one language at a time, and every participant sets their own. If your call switches languages mid-conversation, captions for the other language arrive mangled — so either set the language to whichever one carries the substance, or switch it when the conversation switches.
A bot answering slightly-off-topic replies to clear speech is the signature of a caption language mismatch. Check the language before you debug anything else — and read a few lines of the transcript, where the garbling is obvious.
Google Meet only. Slack huddles have no caption region, so the agent reports call language as unsupported rather than pretending the change worked.

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Interesting side effect

The model reads through a certain amount of garbling. On one call two participants spoke German with captions set to English; the captions arrived as nonsense English and the agent worked out what was happening and replied in German. Fun, and not something to rely on — set the language.