Organization’s security policies block unauthenticated guest access on Windows 10

There are two ways to solve this problem:

1.1 Use the following Group Policy settings:

Computer configuration\administrative templates\network\Lanman Workstation
“Enable insecure guest logons“

Note By enabling insecure guest logons, this setting reduces the security of Windows clients.

1.2 Once you change this then close MMC console without saving and run gpupdate.

2.1 Use Windows Regedit and change the following key if it does not exit then create it.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters]
“AllowInsecureGuestAuth”=dword:1

2.2 Once you do the above reboot your PC.