If you have a non-compliant device, you are notified via email that you must take action. The email specifies the steps you need to take to make the device compliant and you have a 30-day grace period to take action. You'll receive weekly reminders listing the non-compliant device and the remaining grace period days. If after 30 days from receipt of the first notification a device is still non-compliant, it is blocked from accessing the Stanford network till it is made compliant.
If you are using a Mac that is encrypted but MyDevices is reporting that it is not encrypted, see the FAQ for determining Mac encryption status and troubleshooting tips.
MyDevices provides a historical log of all notifications that have been sent regarding a specific device.