Hi Avagon Zales,
The exact name of the local Windows service responsible for the Intune Management Extension that you need to verify is IntuneManagementExtension. In the standard Windows Services console, it appears under the display name Microsoft Intune Management Extension. If this background service has stopped, stalled, or crashed, the client machine will completely fail to check in for Win32 applications, PowerShell scripts, or proactive remediations deployed from the cloud dashboard.
You can quickly check its current operational status or force a manual restart via an elevated PowerShell session by running Get-Service IntuneManagementExtension or Restart-Service IntuneManagementExtension respectively. If the service fails to stay running, it is highly recommended to inspect the diagnostic log files located at C:\ProgramData\Microsoft\IntuneManagementExtension\Logs\IntuneManagementExtension.log to identify the specific error code or policy conflict causing the service crash. I hope the response provided some helpful insight. If it clarified the issue for you, please consider marking it as Accept Answer so others with the same issue can find the solution. Feel free to leave a comment if you need further information.
Tracy.