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So it looks like since Windows 10 version 1709 and forward that SMB2 and SMB3 disables guest access by default for it as a client connecting to an SMB server that forces guest or an unauthenticated credential.
I'll quote and reference the portions of the post that seems relevant to your issue, but I encourage you to read through its entire contents for ...
answered 16 hours ago
Vomit IT - Chunky Mess Style
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