You’re not deleting a registry key named:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Cryptography\Configuration\SSL\00010002\Functions
You’re deleting a registry value, named: Functions
which exists under the key named HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Cryptography\Configuration\SSL\00010002
.
To perform the task you therefore need to use the correct syntax:
Reg Delete "HKLM\SOFTWARE\Policies\Microsoft\Cryptography\Configuration\SSL\00010002" /V "Functions" /F > NUL
You would also need to run the script ‘as Administrator’, to prevent an Access is denied
message.