Sime

If you see this problem and you are not planning to use your printer with Digital Factory right now, what you can do is go into the menu on the printer, go to the cog ⚙ tab, select "Network", scroll down to the "Digital Factory" option. There you can tell the printer to Disconnect. That should stop the printer from trying to connect and producing the pin code message.
 
Those instructions are S3 and S5 printers. The same option exists for UM3 printers, under System menu, then Network, then Digital Factory.