I tested it here, and by removing the type from the body, the payload worked for me.

I used this body request:

{
    "messaging_product": "whatsapp",
    "recipient_type": "individual",
    "to": "<phone_number>",
    "type": "interactive",
    "interactive":{
            "type": "location_request_message",
            "body": {
              "type": "text",
              "text": "Please provide your location"
            },
            "action": {
              "name": "send_location" 
            }         
 }
}