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
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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.