I had same problem, had been working on Win 10, stopped. I tried reinstalling printer multiple times, installed new driver, reboot, power cycle, etc- no good. I had had the 3.12.13 driver, not the 3.13.12 driver FWIW Windows Scan/Fax worked when the Samsung Easy Document creator did not. on the Samsung site https://samsung-printerdrivers.com/samsung-printer-scx-3400-drivers/ there is also an OCR package. After installing THAT, for some reason the scanning started working again!!. (and OCR, tho not very well.) So two ways that might work. Good luck!!
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