Hii,
If the scanner option is missing, do the following:
Go to Start menu > Settings > Bluetooth & devices > Printers & scanners > remove Brother Printer.
Restart on PC
Go to Start menu > Settings > Bluetooth & devices > Printers & scanners > Add devices > Wait on printer/scanner brother on show > click on connect.
Try 1st metodo : Do the following: go to the Start menu > Settings > Bluetooth & devices > Printers & scanners > Click on the printer/scanner > click on the "Scan settings" tab > "More scan and printer settings" > select the Brother printer > right-click and select "Start scan".
In case it doesn't work what is the Brother printer model?
Thanks