To restore communication with Jamf Pro, you must manually re-enroll mobile devices with expired certificates using user-initiated enrollment. For more information, see User-Initiated Enrollment for Mobile Devices in the Jamf Pro Documentation.
When users receive the enrollment invitation, they must follow a series of guided steps to complete the enrollment process. For more information, see User-Initiated Enrollment Experience for Institutionally Owned Mobile Devices in the Jamf Pro Documentation.