Do the following:

• Ensure that the certificate chain is valid and that the configuration is complete on the Exchange Server.
• Try to connect the native email client with the same Exchange Server. If it works as expected, the issue is with client certificate configuration on the XenMobile server ( Only applicable if the customer is using Client cert Authentication)
• Ensure that accept all SSL certificate option is checked under the mdx policies.

Additional Resources

Full XenMobile Deployment Handbook

• Troubleshooting Checklist: Users cannot browse internal websites in Secure Web
• Troubleshooting Checklist: Exchange SSO is not working in Secure Notes for iOS, but does work in Secure Notes for Android.
• Troubleshooting Checklist: Users cannot send notes created using Secure Notes via Secure Mail
• Troubleshooting Checklist: In the ShareFile app, Secure Mail, or Secure Notes, the following error appears: "Your connection is unavailable. Only offline files can be accessed."
• Troubleshooting Checklist: In Secure Mail, an “Access to your company network is not available” error appears.
• Troubleshooting Checklist: In Secure Mail, a “Verify your Single Sign-On credentials” error appears
• Troubleshooting Checklist: Cannot send emails using Secure Mail
• Troubleshooting Checklist: Emails are not syncing in Secure Mail, or email folders are not found, or Secure Mail is prompting users for a password multiple times
• Troubleshooting Checklist: Users cannot access apps in Secure Hub
• Troubleshooting Checklist: Cannot enroll and authenticate a device using Secure Hub
• Troubleshooting Checklist: Cannot get required apps on an iOS device