In Mobility Manager, click Devices [Device] > Details to see a description as to why the email is blocked.
Reasons cited on the Details page are as follows:
Missing device policy
No device policy has been applied to the device.
Failed compliance check
The device is not in compliance with the device policy compliance rule or the policy is missing Access via Email Proxy configuration.
The user is not a provisioned user in the device policy.
Missing email access control settings
Access via Email Proxy configuration has not been configured for the device policy.
No EAS ID
MDM is not installed or not functioning correctly on the device.
Blocked by device policy
The Access via Email Proxy configuration does not allow access for the email app the user is using.
Click Settings > Email Proxy and verify that the proxy is checking in with Mobility Manager.
If the email proxy can't communicate with Mobility Manager, the user's ability to access email is based on the last known device policy. Email access is allowed during this time even if the device becomes non-compliant. But users who are blocked email access continue to be blocked. After the proxy restarts, users are allowed/blocked access based on the most current device policy.