No matter what I try, I can't get it to duplex scan. It doesn't show an option for it in any of the dialog boxes that come up with the various apps I tried (Control Center, iPrint&Scan, Presto!PageManager). Brother's online "support" is a joke, and done of what they advise has worked. I'm about to send it back to Amazon. I'm using a 2016 Mac Mini.
Mac mini 2018 or later
Support for the device is entirely up to Brother, but if you are introducing 3rd party applications they my be interfering and you should remove them.
Duplex Scanning is accessible (according to Brother anyway) from the Control Center 2 application.
https://support.brother.com/g/b/faqend.aspx?c=us&lang=en&prod=mfcj6920dw_us_eu_as&faqid=faq00002741_001#UsingCC2
Make sure you are using the correct support software in addition to the driver for the OS and that model printer
for OS X 10.13 or 10.14 use this driver, and delete the drive in there now.
Full Driver & Software Package
If problems persist try resetting your print system in OS X
https://support.apple.com/en-us/HT203343
Past that if Brother is selling you crap then return it.
Does Brother provide any software for the printer?
If not then all functions of the printer might not be available on a Mac.
Duplex scanning with Brother MFC-J895DW AIO printer.
