Your Digital ID name Cannot be found by underlying Security

Are you facing the problem while trying to open message in Microsoft Outlook, do you see the error “Your Digital ID name cannot be found”?  Yes? Then you’re at the right place. Here we’ll look at the best possible solution to remove this error message.

Nowadays, email encryption is quite popular. Users encrypt their emails to protect sensitive information. Encrypted emails are converted into an unreadable format. You can read the contents of encrypted emails only by decrypting them.

When a user wants to send some confidential information in the form of email message to the receiver, the sender encrypts the message using the public key of the receiver because he don’t want any other person to understand what that message means. And therefore only the receiver will be able to decrypt and read that message using his private key. This is how encryption and decryption work in general.

Sometimes while trying to open the message in outlook users might see this error message because the message is encrypted:

“Your Digital ID name cannot be found by the underlying security system.”

As a result of our research, we found out that this particular error message is caused by the Outlook build. The encryption algorithm in Outlook Build 16.0.8518.1000 has been changed from 3DES to AES256. The recipient sees this error message when he tries to decrypt this email using the previous 3DES certificate.

This error will also appear if you don’t even have the certificate needed to decrypt the email. Below are some fixes you can try to resolve the error.

Method 1: Choose the Correct Certificate

Step1: Open Outlook >> File >> Options

Step 2: Click on Trust Center >> Trust Center Settings >> E-mail Security >> Settings >> Now browse the valid certificate.

If you don’t have any valid certificate that you will need to purchase the new one.

Method 2: Try using the old certificate

If recently you have added a new certificate and after that you are getting this error “Your Digital ID name cannot be found by the underlying security system” then try using the old certificate. This might be possible that the person who sent you encrypted mail is using the old certificate.

Method 3: Try enabling the secure email option

Step 1: Launch Internet Explorer >> Tools >> Internet Options >> Navigate to Content tab >> Certificate >> Personal >> Advance Option >> Now find and check the option Client Authentication & Secure Email option.

Step 2: Click on Save button to save the settings


Here in this article we have explained the reasons of the error “Your Digital ID name cannot be found by the underlying security system” in Outlook and best possible solutions to resolve this error. Hope the methods mentioned above helped you in resolving the issue.

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