You can’t access this shared folder because your organization’s security policies block unauthenticated guest access

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A fix for that is to change the registry

Registry : Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters

DWORD: AllowInsecureGuestAuth = 1

In Windows 11 the DWORD entry might not be there. Then just create it, it will still work.

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