Can someone please clarify which is the correct WhatsApp Business Account ID to use to access the WhatsApp cloud API?

I have properly set up my webhook and can receive messages. However when I try to send a message using the WhatsApp Business Account ID
(marked as number 1 in the attached image) provided here, I get the following error:
error: { message: "Unsupported post request. Object with ID '< my app id>' 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", type: "GraphMethodException", code: 100, error_subcode: 33, fbtrace_id: "AQXqjuSJKTWBnyJdUK_W-jj", },
However when I switch to the second WhatsApp Business Account ID
in the curl command (marked as number 2 in the attached image), it works.
What confuses me is that the incoming message has the first WhatsApp Business Account ID
(marked number 1 in the attached image) like so:
message: { object: "whatsapp_business_account", entry: [ { id: "xxxxxxxxxxxxxxx", // This matches the first changes: [ ... ], }, ], };
I am using the current api v14.0. Is there some setting I need to change?