Explanation
According to the Device enrollment issues with Workspace ONE article3, one of the possible causes of enrollment failure is that the ACC service is not working properly or cannot communicate with the directory service. The administrator can review the ACC logs and test the connection to verify if there are any errors or issues with the ACC service or configuration.
The logs that the administrator should review to begin troubleshooting the Android directory account enrollment issue are AirWatch Cloud Connector (ACC) logs. The ACC is responsible for integrating Workspace ONE UEM with directory services such as Active Directory or LDAP. If the administrator is unable to enroll Android devices with directory accounts, it could indicate that there is a problem with the ACC configuration, connectivity, or synchronization. The administrator should review the ACC logs to identify and troubleshoot the root cause of the issue3.

Explanation
The organization's Apple Push Notification certificate expired. The Apple Push Notification certificate is a certificate that allows Workspace ONE UEM to communicate with iOS devices using push notifications. Push notifications are required for iOS devices to check in and receive email configuration profiles from Workspace ONE UEM. If the Apple Push Notification certificate expires or becomes invalid, iOS devices will not be able to check in or receive email configuration profiles, and their email inbox will fail to load. The administrator should check and renew the Apple Push Notification certificate if needed.