HTTP connection downlinks not sent

HTTP connection downlinks not sent

Hello Thingpark team,

We are experimenting TP Entreprise with a few devices and gateways.
Uplinks are transferred to our application server via a TP X IoT HTTP connection. We also use the url provided with the connection to send downlinks. It worked well a few weeks ago.

However we connected a new device this week and downlinks are not sent to the device (uplinks are ok). We also noticed that on TP X IoT connections are listed without any device attached while device are actually registered with the connection on TP Entreprise.
Sending DL works from the TP Entreprise device page but not TP X connection page.

We tried restarting and creating new connections without success.
Can you please help us here ?

Thank you