AI assistant isn't picking up the customer's name in the first message of the script

Hi, I'm making a post request to Vapi to create a phone call. The call goes through and the customer number and name is successfully passed (I can confirm this because I trigger an SMS being sent to the customer later on in my automation and I do a GET request from the Vapi call ID to pull the name and number).

However when I answer the call, the agents says 'Hey, is this speaking?' instead of 'Hey, is this <first name> speaking?'.

How can I make sure that the agent says the customer's name?

The image attached is the output of the post request.
Screenshot_2024-03-30_at_20.26.15.png
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