Enable insecure guest logons

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Computer Config > Administrative Templates > Network > Lanman Workstation > Enable insecure guest logons > Enable

And

REG ADD "HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters" /v "AllowInsecureGuestAuth" /t REG_DWORD /d 1 /f

Disable SMB signing (System error 3227320323 has occurred):

Set-SmbClientConfiguration -RequireSecuritySignature $false -Force

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