My assistant is not saying the custom message when forwarding

It keeps saying "Transfering the call now" instead of my custom message: "Thank you. I'm sending your call to our roofing technician now. Have a great day, goodbye!"

Here is how I have the forwardingPhoneNumbers (Phone number hidden):
"forwardingPhoneNumbers": [
{
"number": "+1213XXXXXXX",
"message": "Thank you. I'm sending your call to our roofing technician now. Have a great day, goodbye!"
}
],
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