Try the below Brother Printer Offline Fix to bring your printer in a working state.
Make sure your printer is switched on. Check if the power cord is plugged into the socket or not or try plugging it into another port.
Next, you need to ensure that the USB cable connecting your Brother printer and device is connected and working properly. Try replacing it temporarily and see if that works for you. Connect it directly to the computer instead of the Hub.
In the case of ethernet cable, make sure it is connected to both, your printer and router
Print the network configuration page to check the IP address in case of Ethernet cable connection and a wireless printer.
Set your printer as default and delete all the print jobs in the queue.
Check the printer status and disable the Use Printer Offline or Pause Printing mode if any of them is enabled.