Unable to Create Disable hardware acceleration key for Google Chrome

Hi,

I'm trying to set the registry key to disable hardware acceleration in Google Chrome https://www.technipages.com/google-chrome-enable-disable-hardware-acceleration-mode  via registry entry.

I created a new User Environment Registry setting - set to apply after profile import

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Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Immidio\Flex Profiles\ImportMarkers]
"Pre"=dword:b0dafda1

[HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome]
"HardwareAccelerationModeEnabled"=dword:00000001

[HKEY_CURRENT_USER\Software\Immidio\Flex Profiles\ImportMarkers]
"Post"=dword:7004260c

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Doesn't work.  In fact, anything I try to create in this hive seems to fail.

From what I've read HLLM and HKCU are supported registry hives for UEM.

Any idea what's wrong here?

Regards