Probably because SMBv1 is no longer on the PC....newer versions of Win10 don't have that enabled by default..they have SMB2 and 3.
You can enable SMB1...BUT...I strongly advise against it, it's a huge security risk, easily pillaged by malware and ransomware.
The real answer is "Upgrade your MFPs so they support SMBv 2 and 3."
You can test is this is your issue by temporarily enabling SMBv1 on the host...seeing if that fixes the issue, and then disabled it again. And then hopefully your MFP has a firmware update to introduce newer SMB support.
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