After upgrading to Windows Server 2022, you cannot access insecure shares \\

Add the following Registry key: 
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters \\
 AllowInsecureGuestAuth  DWORD Value 1\\

Add it through PowerShell:
<cli type=doc>New-Item -Path 'HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters' -Name AllowInsecureGuestAuth -PropertyType DWORD -Value 1</cli>