Error Message List HENNGE Device Certificate (iOS / iPadOS) – HENNGE One Help Center

This article is based on the product specifications as of January 2026.

* If the issue persists after following the troubleshooting steps, please record the following information and contact your system admin.
If you are a HENNGE One admin, please provide this information to HENNGE One Technical Support.
・Error message
・[Device Certificate Information] included in the Device Certificate issuance email

HENNGE Device Certificate for iOS
Error message	Cause / Solution
This service is only available on iPhone / iPad.	You may not be using an iPhone or iPad. Please make sure you are installing on an iPhone or iPad device.
The specified URL is invalid.	You are accessing an incorrect URL. Please access the correct URL provided in the Device Certificate issuance email.
Could not register with the profile service.	An error occurred due to a communication failure or similar issue. Please try again later in a location with a stable network connection.
ERROR_SCEP_ENROLL	An error occurred due to a communication failure or similar issue. Please try again later in a location with a stable network connection.
The SCEP server returned an invalid response.	An error occurred due to a communication failure or similar issue. Please try again later in a location with a stable network connection.
Unable to verify the server's identification information	An error occurred during server certificate verification. Tap [Cancel] to abort the operation, check that the date set on your iPhone / iPad is correct, and then try again.
The certificate has already been revoked.	The admin may have revoked the certificate. Please contact your system admin.
Download the certificate is not permitted.	The admin may have revoked the certificate. Please contact your system admin.
The certificate has expired.	The download period may have expired. Please contact your system admin.
Certificate issuance information not found.	A Device Certificate corresponding to your iPhone / iPad has not been issued. Please install the Device Certificate from a device authorized by the admin. The admin should confirm that the issued Device Certificate matches the device information.
The transaction with the server failed due to a "403" status.	A Device Certificate corresponding to your iPhone / iPad has not been issued. Please install the Device Certificate from a device authorized by the admin. The admin should confirm that the issued Device Certificate matches the device information.
Could not connect to the server.	A Device Certificate corresponding to your iPhone / iPad has not been issued. Please install the Device Certificate from a device authorized by the admin. The admin should confirm that the issued Device Certificate matches the device information. If you are installing using "IMEI" on devices running iOS 12 or later, please also check theSIM card status. If your device has multiple IMEIs, please issue the certificate using the IMEI labeled as "IMEI", "IMEI1", "Primary line", or "Physical SIM".
Could not establish a connection to the server.	A Device Certificate corresponding to your iPhone / iPad has not been issued. Please install the Device Certificate from a device authorized by the admin. The admin should confirm that the issued Device Certificate matches the device information. If you are installing using "IMEI" on devices running iOS 12 or later, please also check theSIM card status. If your device has multiple IMEIs, please issue the certificate using the IMEI labeled as "IMEI", "IMEI1", "Primary line", or "Physical SIM".
The request timed out.	A Device Certificate corresponding to your iPhone / iPad has not been issued. Please install the Device Certificate from a device authorized by the admin. The admin should confirm that the issued Device Certificate matches the device information.
Could not install the profile.The MDM server at https://cybertrust.deviceid.ne.jp/iPhoneOTA/do/auth returned a status code of "403".	A Device Certificate corresponding to your iPhone / iPad has not been issued. Please install the Device Certificate from a device authorized by the admin. The admin should confirm that the issued Device Certificate matches the device information. If your device has multiple IMEIs, please issue the certificate using the IMEI labeled as "IMEI", "IMEI1", "Primary line", or "Physical SIM". * If you are using the IMEI associated with an eSIM as the Device ID for Device Certificate issuance, the eSIM must be selected for mobile data communication. If it is not selected for mobile data communication, please select it, restart the device, and try the installation again. If you are installing using IMEI on devices running iOS 12 or later, please also check the SIM card status. If the device cannot correctly recognize the IMEI due to a device issue, please insert the SIM card, restart the device, and try the installation again. If the "Stolen Device Protection" feature introduced in iOS 17.3 or later is enabled, installation of the Device Certificate profile may be restricted. [Device Certificate] Installing Device Certificates (iOS / iPadOS) See step 3 for instructions on how to check if this feature is disabled. If it is enabled, please temporarily disable it and try the installation again. As a workaround, try issuing and installing the Device Certificate using "UDID" instead of "IMEI".