I am able to install Azure monitor Agent installation without enabling any managed identity(system or user) on a Virtual Machine through below powershell cmdlet

System-Assigned:
Set-AzVMExtension -Name AzureMonitorWindowsAgent -ExtensionType AzureMonitorWindowsAgent -Publisher Microsoft.Azure.Monitor -ResourceGroupName <resource-group-name> -VMName <virtual-machine-name> -Location <location> -TypeHandlerVersion <version-number> -EnableAutomaticUpgrade $true -SettingString '{"authentication":{"managedIdentity":{"identifier-name":"mi_res_id","identifier-value":"/subscriptions/<my-subscription-id>/resourceGroups/<my-resource-group>/providers/Microsoft.ManagedIdentity/userAssignedIdentities/<my-user-assigned-identity>"}}}'

User-Assigned:
Set-AzVMExtension -Name AzureMonitorWindowsAgent -ExtensionType AzureMonitorWindowsAgent -Publisher Microsoft.Azure.Monitor -ResourceGroupName <resource-group-name> -VMName <virtual-machine-name> -Location <location> -TypeHandlerVersion <version-number> -EnableAutomaticUpgrade $true


I have used both of the above powershell cmdlets on a set of VMs and did not assigned any system or user assigned managed identity but If I run the power shell script I am still able tp install the agent and no change is reflecting in identity section of VM.
Can someone help me understand the AMA installation process if I am getting in wrong direction.

I have built powershell script using below documentation
https://learn.microsoft.com/en-us/azure/azure-monitor/agents/azure-monitor-agent-manage?tabs=azure-portal