Ah, parameter mismatches with the Google Calendar tool in VAPI are a common snag. Have them double-check the mapping of their voice agent's output to the API's expected parameters, especially the data types and formatting for fields like dates and times. Often, a small discrepancy there is the culprit. If they can share a specific example of the action they're trying and the error message, I might be able to offer more targeted advice. 📥