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Clearly, the setting in the Ricoh machine, for the destination of the scanning operation - i.e. the folder on the computer where the scanned file is to be stored - is no longer authorized or 'authenticated' to receive a file from the Ricoh machine.
You might both
A. check the destination folder setting in the Ricoh machine. Check whether the username-password ***** listed there for that folder (and for that matter, the destination path) is still valid, and check that you can indeed access that username on that machine at that destination with that password.
B. set up the destination settings and authentication settings anew on the Ricoh machine, ideally to a completely new folder for the purpose of receiving scans.
Something about the update to Windows 10 - or perhaps a sheer coincidence that changed at the same time? - has caused something in the Ricoh's settings to no longer work, to no longer be a winner with the destination system.