Hyper-V Core Server 2019 ignoring power plan thresholds

I am attempting to tweak Hyper-V Core Server 2019 (host) power thresholds, however my attempts have failed so far.

Scenario

The newly created Hyper-V 2019 Server (part of Workgroup, not yet a Domain) has been attached to an external UPS. Battery status is provided through a USB cable. The UPS is listed in the device list and battery status can be queried through Powershell gwmi win32_battery command.

My goal is to shutdown the machine when Low level threshold (30%) is reached, to allow graceful shutdown of both VMs and host.

As the HV machine has no GUI, power plan settings must be tweaked by other means.

My first attempt was to change settings through Group Policy Editor snap-in in MMC from a remote computer: Computer configuration > Administrative Templates > System > Power Management > Notification Settings > Low battery notification Level (& action). Forced GPUPDATE on HV machine, settings ignored!

I have then attempted to change setting through powercfg:

powercfg -setdcvalueindex SCHEME_CURRENT SUB_BATTERY BATLEVELLOW 30
powercfg -setdcvalueindex SCHEME_CURRENT SUB_BATTERY BATACTIONLOW 3

However also these settings are ignored, although they appear as correctly set when querying power plans:

 Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e  (Balanced)
  GUID Alias: SCHEME_BALANCED
  Subgroup GUID: fea3413e-7e05-4911-9a71-700331f1c294  (Settings belonging to no subgroup)
    GUID Alias: SUB_NONE
  Subgroup GUID: 0012ee47-9041-4b5d-9b77-535fba8b1442  (Hard disk)
    GUID Alias: SUB_DISK
    Power Setting GUID: 6738e2c4-e8a5-4a42-b16a-e040e769756e  (Turn off hard disk after)
      GUID Alias: DISKIDLE
      Minimum Possible Setting: 0x00000000
      Maximum Possible Setting: 0xffffffff
      Possible Settings increment: 0x00000001
      Possible Settings units: Seconds
    Current AC Power Setting Index: 0x00000000
    Current DC Power Setting Index: 0x00000000

  Subgroup GUID: 238c9fa8-0aad-41ed-83f4-97be242c8f20  (Sleep)
    GUID Alias: SUB_SLEEP
    Power Setting GUID: 29f6c1db-86da-48c5-9fdb-f2b67b1f44da  (Sleep after)
      GUID Alias: STANDBYIDLE
      Minimum Possible Setting: 0x00000000
      Maximum Possible Setting: 0xffffffff
      Possible Settings increment: 0x00000001
      Possible Settings units: Seconds
    Current AC Power Setting Index: 0x00000000
    Current DC Power Setting Index: 0x00000000

    Power Setting GUID: 94ac6d29-73ce-41a6-809f-6363ba21b47e  (Allow hybrid sleep)
      GUID Alias: HYBRIDSLEEP
      Possible Setting Index: 000
      Possible Setting Friendly Name: Off
      Possible Setting Index: 001
      Possible Setting Friendly Name: On
    Current AC Power Setting Index: 0x00000001
    Current DC Power Setting Index: 0x00000001

    Power Setting GUID: 9d7815a6-7ee4-497e-8888-515a05f02364  (Hibernate after)
      GUID Alias: HIBERNATEIDLE
      Minimum Possible Setting: 0x00000000
      Maximum Possible Setting: 0xffffffff
      Possible Settings increment: 0x00000001
      Possible Settings units: Seconds
    Current AC Power Setting Index: 0x00000000
    Current DC Power Setting Index: 0x00000000

    Power Setting GUID: bd3b718a-0680-4d9d-8ab2-e1d2b4ac806d  (Allow wake timers)
      GUID Alias: RTCWAKE
      Possible Setting Index: 000
      Possible Setting Friendly Name: Disable
      Possible Setting Index: 001
      Possible Setting Friendly Name: Enable
      Possible Setting Index: 002
      Possible Setting Friendly Name: Important Wake Timers Only
    Current AC Power Setting Index: 0x00000001
    Current DC Power Setting Index: 0x00000001

  Subgroup GUID: 2a737441-1930-4402-8d77-b2bebba308a3
    Power Setting GUID: 48e6b7a6-50f5-4782-a5d4-53bb8f07e226
    Current AC Power Setting Index: 0x00000001
    Current DC Power Setting Index: 0x00000001

  Subgroup GUID: 2e601130-5351-4d9d-8e04-252966bad054  (Idle Resiliency)
    GUID Alias: SUB_IR
  Subgroup GUID: 48672f38-7a9a-4bb2-8bf8-3d85be19de4e  (Interrupt Steering Settings)
    GUID Alias: SUB_INTSTEER
  Subgroup GUID: 4f971e89-eebd-4455-a8de-9e59040e7347  (Power buttons and lid)
    GUID Alias: SUB_BUTTONS
    Power Setting GUID: 5ca83367-6e45-459f-a27b-476b1d01c936  (Lid close action)
      GUID Alias: LIDACTION
      Possible Setting Index: 000
      Possible Setting Friendly Name: Do nothing
      Possible Setting Index: 001
      Possible Setting Friendly Name: Sleep
      Possible Setting Index: 002
      Possible Setting Friendly Name: Hibernate
      Possible Setting Index: 003
      Possible Setting Friendly Name: Shut down
    Current AC Power Setting Index: 0x00000001
    Current DC Power Setting Index: 0x00000001

    Power Setting GUID: 7648efa3-dd9c-4e3e-b566-50f929386280  (Power button action)
      GUID Alias: PBUTTONACTION
      Possible Setting Index: 000
      Possible Setting Friendly Name: Do nothing
      Possible Setting Index: 001
      Possible Setting Friendly Name: Sleep
      Possible Setting Index: 002
      Possible Setting Friendly Name: Hibernate
      Possible Setting Index: 003
      Possible Setting Friendly Name: Shut down
      Possible Setting Index: 004
      Possible Setting Friendly Name: Turn off the display
    Current AC Power Setting Index: 0x00000003
    Current DC Power Setting Index: 0x00000003

    Power Setting GUID: 96996bc0-ad50-47ec-923b-6f41874dd9eb  (Sleep button action)
      GUID Alias: SBUTTONACTION
      Possible Setting Index: 000
      Possible Setting Friendly Name: Do nothing
      Possible Setting Index: 001
      Possible Setting Friendly Name: Sleep
      Possible Setting Index: 002
      Possible Setting Friendly Name: Hibernate
      Possible Setting Index: 003
      Possible Setting Friendly Name: Shut down
      Possible Setting Index: 004
      Possible Setting Friendly Name: Turn off the display
    Current AC Power Setting Index: 0x00000000
    Current DC Power Setting Index: 0x00000000

    Power Setting GUID: a7066653-8d6c-40a8-910e-a1f54b84c7e5  (Start menu power button)
      GUID Alias: UIBUTTON_ACTION
      Possible Setting Index: 000
      Possible Setting Friendly Name: Sleep
      Possible Setting Index: 001
      Possible Setting Friendly Name: Hibernate
      Possible Setting Index: 002
      Possible Setting Friendly Name: Shut down
    Current AC Power Setting Index: 0x00000002
    Current DC Power Setting Index: 0x00000002

  Subgroup GUID: 501a4d13-42af-4429-9fd1-a8218c268e20  (PCI Express)
    GUID Alias: SUB_PCIEXPRESS
    Power Setting GUID: ee12f906-d277-404b-b6da-e5fa1a576df5  (Link State Power Management)
      GUID Alias: ASPM
      Possible Setting Index: 000
      Possible Setting Friendly Name: Off
      Possible Setting Index: 001
      Possible Setting Friendly Name: Moderate power savings
      Possible Setting Index: 002
      Possible Setting Friendly Name: Maximum power savings
    Current AC Power Setting Index: 0x00000001
    Current DC Power Setting Index: 0x00000002

  Subgroup GUID: 54533251-82be-4824-96c1-47b60b740d00  (Processor power management)
    GUID Alias: SUB_PROCESSOR
    Power Setting GUID: 893dee8e-2bef-41e0-89c6-b55d0929964c  (Minimum processor state)
      GUID Alias: PROCTHROTTLEMIN
      Minimum Possible Setting: 0x00000000
      Maximum Possible Setting: 0x00000064
      Possible Settings increment: 0x00000001
      Possible Settings units: %
    Current AC Power Setting Index: 0x00000005
    Current DC Power Setting Index: 0x00000005

    Power Setting GUID: 94d3a615-a899-4ac5-ae2b-e4d8f634367f  (System cooling policy)
      GUID Alias: SYSCOOLPOL
      Possible Setting Index: 000
      Possible Setting Friendly Name: Passive
      Possible Setting Index: 001
      Possible Setting Friendly Name: Active
    Current AC Power Setting Index: 0x00000001
    Current DC Power Setting Index: 0x00000000

    Power Setting GUID: bc5038f7-23e0-4960-96da-33abaf5935ec  (Maximum processor state)
      GUID Alias: PROCTHROTTLEMAX
      Minimum Possible Setting: 0x00000000
      Maximum Possible Setting: 0x00000064
      Possible Settings increment: 0x00000001
      Possible Settings units: %
    Current AC Power Setting Index: 0x00000064
    Current DC Power Setting Index: 0x00000064

  Subgroup GUID: 7516b95f-f776-4464-8c53-06167f40cc99  (Display)
    GUID Alias: SUB_VIDEO
    Power Setting GUID: 3c0bc021-c8a8-4e07-a973-6b14cbcb2b7e  (Turn off display after)
      GUID Alias: VIDEOIDLE
      Minimum Possible Setting: 0x00000000
      Maximum Possible Setting: 0xffffffff
      Possible Settings increment: 0x00000001
      Possible Settings units: Seconds
    Current AC Power Setting Index: 0x00000258
    Current DC Power Setting Index: 0x0000012c

    Power Setting GUID: aded5e82-b909-4619-9949-f5d71dac0bcb  (Display brightness)
      Minimum Possible Setting: 0x00000000
      Maximum Possible Setting: 0x00000064
      Possible Settings increment: 0x00000001
      Possible Settings units: %
    Current AC Power Setting Index: 0x00000064
    Current DC Power Setting Index: 0x00000028

    Power Setting GUID: f1fbfde2-a960-4165-9f88-50667911ce96  (Dimmed display brightness)
      Minimum Possible Setting: 0x00000000
      Maximum Possible Setting: 0x00000064
      Possible Settings increment: 0x00000001
      Possible Settings units: %
    Current AC Power Setting Index: 0x00000032
    Current DC Power Setting Index: 0x00000032

    Power Setting GUID: fbd9aa66-9553-4097-ba44-ed6e9d65eab8  (Enable adaptive brightness)
      GUID Alias: ADAPTBRIGHT
      Possible Setting Index: 000
      Possible Setting Friendly Name: Off
      Possible Setting Index: 001
      Possible Setting Friendly Name: On
    Current AC Power Setting Index: 0x00000000
    Current DC Power Setting Index: 0x00000000

  Subgroup GUID: 8619b916-e004-4dd8-9b66-dae86f806698  (Presence Aware Power Behavior)
    GUID Alias: SUB_PRESENCE
  Subgroup GUID: e73a048d-bf27-4f12-9731-8b2076e8891f  (Battery)
    GUID Alias: SUB_BATTERY
    Power Setting GUID: 637ea02f-bbcb-4015-8e2c-a1c7b9c0b546  (Critical battery action)
      GUID Alias: BATACTIONCRIT
      Possible Setting Index: 000
      Possible Setting Friendly Name: Do nothing
      Possible Setting Index: 001
      Possible Setting Friendly Name: Sleep
      Possible Setting Index: 002
      Possible Setting Friendly Name: Hibernate
      Possible Setting Index: 003
      Possible Setting Friendly Name: Shut down
    Current AC Power Setting Index: 0x00000000
    Current DC Power Setting Index: 0x00000003

    Power Setting GUID: 8183ba9a-e910-48da-8769-14ae6dc1170a  (Low battery level)
      GUID Alias: BATLEVELLOW
      Minimum Possible Setting: 0x00000000
      Maximum Possible Setting: 0x00000064
      Possible Settings increment: 0x00000001
      Possible Settings units: %
    Current AC Power Setting Index: 0x0000000a
    Current DC Power Setting Index: 0x0000001e

    Power Setting GUID: 9a66d8d7-4ff7-4ef9-b5a2-5a326ca2a469  (Critical battery level)
      GUID Alias: BATLEVELCRIT
      Minimum Possible Setting: 0x00000000
      Maximum Possible Setting: 0x00000064
      Possible Settings increment: 0x00000001
      Possible Settings units: %
    Current AC Power Setting Index: 0x00000005
    Current DC Power Setting Index: 0x00000014

    Power Setting GUID: bcded951-187b-4d05-bccc-f7e51960c258  (Low battery notification)
      GUID Alias: BATFLAGSLOW
      Possible Setting Index: 000
      Possible Setting Friendly Name: Off
      Possible Setting Index: 001
      Possible Setting Friendly Name: On
    Current AC Power Setting Index: 0x00000001
    Current DC Power Setting Index: 0x00000001

    Power Setting GUID: d8742dcb-3e6a-4b3c-b3fe-374623cdcf06  (Low battery action)
      GUID Alias: BATACTIONLOW
      Possible Setting Index: 000
      Possible Setting Friendly Name: Do nothing
      Possible Setting Index: 001
      Possible Setting Friendly Name: Sleep
      Possible Setting Index: 002
      Possible Setting Friendly Name: Hibernate
      Possible Setting Index: 003
      Possible Setting Friendly Name: Shut down
    Current AC Power Setting Index: 0x00000003
    Current DC Power Setting Index: 0x00000003

Regardless my attempts, the Hyper-V host will shutdown at 10% battery level.

What am I missing?