:sos: Error saving workflow – ISO 639-1 language issue

Hi everyone! I’m building a restaurant reservation workflow on Vapi and I keep getting this error when trying to save:

❌ “Failed to save workflow: each value in nodes.voice.language must be a valid ISO 639-1 language code. Example: ‘en’ for English, ‘es’ for Spanish.

I’ve already set the language to it (Italian) both in:
• the assistant language settings
• the transcriber settings

Still, this error persists and I can’t identify which node is causing it.

🧩 I’m using several Conversation, API Request, and Condition nodes.

Any idea where exactly I need to define nodes.voice.language to fix this? Is there a hidden setting per node?

Thanks in advance 🙏
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