When a user encounters a Brother Printer offline issue, a message gets displayed on the screen of your Printer notifying you about the issue. In most cases, a user faces an offline issue because of the improper connection between a computer and your printer. If you have connected your Printer wirelessly to your computer, make sure that your computer or laptop is within the Wi-Fi range of your Printer. If a user has connected his printer in a wired connection, check that the wires are properly connected to your computer or not.
https://whybrotherprinteroffline.com/brother-printer-not-printing/
https://whybrotherprinteroffline.com/brother-printer-offline-fix/
https://whybrotherprinteroffline.com/brother-printer-drivers-not-available/