Did you check the connection of your printer with the wifi? There are a lot of cases it so happens due to a bad connection between the printer and the wifi network that shows the printer offline. Switch off the wireless network and power on the router after 60 seconds and restart your Brother printer as well. Now check and see if the printer is showing offline or not.
- click on your Windows search bar and type Devices and Printer.
- Search for your printer from the list.
- Right click on the printer and uncheck if it checked on the option use printer offline.
- Right click on the printer and and click on Set as Default Printer.
update your Brother printer driver. Go to the brother support page and search for your brother printer model name and download the latest version of printer driver software.