SMB3 is the issue. The older devices do not support it. So if you have a printer that cannot do it, and there is no longer firmware in development (the 7232 hasn't had an update since 2013, the 4150 I have no idea, sorry) then you need to change how Windows handles it, or setup a NAS drive for Win 10 users to access their scans
Ive noticed that the new connect key devices scan just fine but some of the legacy devices such as 7232, 4150, etc will not complete. Is this due to a certain version of SMB? Please help me understand.