You need to configure the desktop action for the MaintenanceScheduler cloud flow.

According to the scenario, you want to configure the desktop action to run on any available machine in a machine group and to time out after 20 minutes if no machine is available. To do this, you need to select machine settings in Power Automate for desktop and choose a machine group as the target device for your desktop action. Then, you need to select the Timeout property and update the duration to PT20M, which stands for 20 minutes in ISO 8601 format. You do not need to launch Power Automate for desktop or navigate to Desktop flow action settings in the cloud flow, as these steps are not relevant for configuring the desktop action. You also do not need to select C as an answer, as P20M is not a valid ISO 8601 duration format.