1) Is your agent connected to the management site?
To manage your Windows 10 Mobile device, the management site needs to communicate with your agent.
Please check your device internet connectivity.
2) Have you activated the license yet?
To use the functions of your Windows 10 Mobile device, you need to activate the license.
For details on how to activate the agent, refer to "Basic Operations－Activate device" in《Windows 10 Mobile User Manual》