Google Chat - Unsupported schema node. Use Raw mode

Google Chat: "Unsupported schema node. Use Raw mode" error
I'm trying to set up Google Chat integration and getting an "Unsupported schema node. Use Raw mode" error in the OpenClaw Control UI.
My config:
json"googlechat": {
"enabled": true,
"serviceAccount": "{"type":"service_account","project_id":"openclaw-redrun",...}",
"audienceType": "project-number",
"audience": "470382474728",
"dm": {
"policy": "pairing",
"allowFrom": ["marc@redruncannabiscompany.com"]
}
}
Symptoms:

Bot appears in Google Chat but doesn't respond to messages
Google Cloud Logs show: "Chat app didn't respond or its response was invalid"
No incoming webhook requests appear in OpenClaw logs (even in debug mode)
Tailscale Funnel endpoint works: https://tc-office-desk.tail297130.ts.net/googlechat

Question: What does "Use Raw mode" mean and how do I fix this? Is my service account JSON format wrong?
OpenClaw 2026.1.29, Google Workspace account, service account has roles/chat.owner.
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