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

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.