In a Firefox tab, in the URL line, enter
localhost:631
Click on the Administration TAB
Click on “Add Printer” icon
May have to login as root
At this window
choose "Internet Printing Protocaol (ipp)
In the next window, enter the STATIC IP address of the Brother Printer as
ipp://192.168.0.123
At the choose driver window, choose “IPP Everywhere”
Then see if the printer works for you. A static IP address at the Brother printer is essential. Use the LCD screen on the printer to find or set a static IP address for the printer.
Pudge
EDIT:
I assume
indicates your printer is on an ethernet LAN ?
EDIT 2:
Where are my manners, Welcome to the EndeavourOS forum. I hope you enjoy your time here.
Pudge