Unable to Create a call using api

Whenever I try to create a call out using Vapi API, I get this error:
{
"message": [
"customers.0.number must be a valid phone number in the E.164 format. Hot tip, you may be missing the country code (Eg. US: +1)."
],
"error": "Bad Request",
"statusCode": 400
}

The phone number is in the correct format.
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