V4 downlink mqtt message node red not working

Hi,
I’m trying to send a mqtt downlink message via node red mqtt. It works in v3 so I can see the message queued waiting for an uplink message. If I try to do the same in v4 I don’t see the message queued inside the device application. What I’m doing wrong?

This is the topic
application/xxxxxxxx-91fe-41e8-85d1-1ec497ee32be/device/58a0cb0000108d64/command/down

And this the payload

msg.payload = {
“confirmed”: false,
“fport”: 204,
“data”: “ADwA”
}

return msg;

Regards

Hi,
My mistake, this is the correct way to conform the message

msg.payload = {
“confirmed”: false,
“fPort”: 204,
“data”: “ADwA”,
“devEui”: “58a0cb0000108d64”
}

return msg;