Hi, setting up WhatsApp Business API. We have gone as far as the webhook config. We can receive message, but when we respond back - i get the below error.

OAuth "Facebook Platform" "invalid_request" "Unsupported post request. Object with ID '119308574466178' does not exist, cannot be loaded due to missing permissions, or does not support this operation. Please read the Graph API documentation at https://developers.facebook.com/docs/graph-api

Weird thing is that number being used is the the test number.

essentially inbound messages are coming, but can not send outbound messages - is there any advise?