Try this solution here CUPS not detecting Brother HL-L2350DW IPP Everywhere laser printer - #8 by danielton
I’m not sure if avahi is normally enabled by default but it it isn’t this might fix your problem.
If this doesn’t work we may need more info:
OM version
Desktop environment
Are you connecting via wifi or cable
Where did you get the rpm, I have read in other threads that rpms can be specific to a disrobution so there could be dependency problems if it wasn’t packaged for OM, I could be wrong about this maybe someone will clarify. Hopefully this will get you started.