Just wanted to add that Windows 10 Update Version 2004 broke access for both computers I applied the update to.
While the GPO showed Lanman Workstation allowing insecure guest logons, it wasn't working.
When investigating the Registry, it showed a value of 0, so it was not active, and the GPO was not being applied.
Had to perform registry edit as show in previous link to once again make active and restore connectivity.
Regedit Path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters
SHOW LESS
