Quote from printeralign on April 13, 2023, 2:35 am

Every mac user faces printer offline error while they go to the printing preferences and they can't print anything from their brother printer. There could be various reasons why your brother printer is offline on mac. 

1. Printer could have lost its connectivity to your wireless network, 
2. Another reason could be due to outdated printer drivers or a software issue, 
3. In some cases, the printer's power or cable connections may also be the culprit. 

It's important to troubleshoot the issue to determine the exact cause and take necessary steps accordingly.