> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# VmUnassignmentStartedEventPayload

> VmUnassignmentStartedEventPayload data type.

## Properties

| Name | Type | Description |
| :- | :- | :- |
| AssignmentDurationMs | double | The duration (milliseconds) that the VM has been assigned. |
| BillingAssignmentCorrelationId | String | The guid string ID of the billing assignment. |
| BuildId | String | The guid string ID of the build. |
| Region | [AzureRegion](https://docs.xbox.com/services/playfab/api-references/events/data-types/azureregion.md) | The build region. |
| SessionId | String | The guid string ID of the session. |
| UnassignmentEventTimestamp | DateTime | The time (UTC) the virtual machine unassignment started. |
| VmId | String | The virtual machine ID that is being unassigned. |
| VmOs | String | The virtual machine's operating system. |


## Related topics

- [vm_unassignment_started](https://docs.xbox.com/services/playfab/api-references/events/MultiplayerServers/vm-unassignment-started.md)
- [VmAssignedEventPayload](https://docs.xbox.com/services/playfab/api-references/events/data-types/vmassignedeventpayload.md)
- [VmUnhealthyEventPayload](https://docs.xbox.com/services/playfab/api-references/events/data-types/vmunhealthyeventpayload.md)
- [vm_assigned](https://docs.xbox.com/services/playfab/api-references/events/MultiplayerServers/vm-assigned.md)
- [vm_unhealthy](https://docs.xbox.com/services/playfab/api-references/events/MultiplayerServers/vm-unhealthy.md)