As a workaround, avoid using IPP for network printers or for network print boxes (like your Livebox 2). Instead, use the "AppSocket/HP JetDirect" connection. If your Livebox 2 or your printer does not appear in the list of auto-detected printers or if it has only IPP in its "Connection" list, use the "AppSocket/HP JetDirect" entry and enter the IP address of your Livebox 2.
As a workaround, avoid using IPP for network printers or for network print boxes (like your Livebox 2). Instead, use the "AppSocket/HP JetDirect" connection. If your Livebox 2 or your printer does not appear in the list of auto-detected printers or if it has only IPP in its "Connection" list, use the "AppSocket/HP JetDirect" entry and enter the IP address of your Livebox 2.