3D Printer OS not allowing me to send to Dremel 3D40 Printers in my printers area

3D Printer OS is not allowing me to access my Dremel 3D40 Printers to send prints to them. I have tried slicing it inside of the OS and uploading a G-Code. Neither work. Any thoughts?

Hello. How do you connect printer to 3DPrinterOS? Is it USB to 3DPrinterOS Client connection or direct connection from printer’s firmware?