Data Protection Issues

How to Access Encrypted Email Without a One-Time Passcode in Outlook

Kushani Nimanthika Oct 23, 2026 868 views

Question details

The user needs to locate a missing Office Message Encryption passcode or find alternative ways to open an encrypted email.

How to Access Encrypted Email Without a One-Time Passcode in Outlook

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Attempting to open a secure email but the required one-time passcode does not arrive or has expired.
Observed behavior: The recipient is unable to access the encrypted email content due to a missing or expired 15-minute one-time passcode.

Before you start

Ensure you have a stable internet connection and wait a few minutes, as automated email delivery can sometimes be delayed. Have the sender's contact information ready in case you need to request a new encrypted message.

Solution 1Recommended

Locate the Passcode or Request a Resend

Search thoroughly for the passcode email and request a new one if the original has expired.

One-time passcodes for Office Message Encryption expire after 15 minutes for security reasons. If the code is not found or has timed out, requesting a new message is necessary.

Search all email folders

Check your Inbox, Spam, Junk, and Clutter folders for the passcode message. Sometimes security filters redirect automated emails.

Check Outlook on the web

Log in to your email provider's webmail interface (such as Outlook on the web) to see if the passcode message arrived there but failed to sync to your desktop app.

Request a new email

Contact the sender and ask them to resend the encrypted email to generate a fresh 15-minute passcode.

Passcode Expiration: A one-time passcode is strictly valid for 15 minutes. Attempting to use it after this period will result in an error.

Solution 2

Open the Message Directly in the Outlook Desktop Client

If the email was sent using Information Rights Management (IRM), you may bypass the passcode requirement by using the native Outlook app.

Solution 3

Run a Message Trace via Exchange Admin

If passcodes consistently fail to arrive, an IT administrator can trace the delivery status.

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Frequently Asked Questions

Why did my one-time passcode expire before I could use it?

Office Message Encryption passcodes are designed to expire after 15 minutes for security reasons. If you don't use it within that timeframe, you will need to request the sender to send a new encrypted email.

Can I disable the one-time passcode requirement for encrypted emails?

End users cannot disable this requirement. However, an Exchange Online administrator can manage one-time passcode settings for the entire organization using Exchange Online PowerShell.

Why do some encrypted emails open without a passcode?

If the sender used Information Rights Management (IRM) and you are using the Outlook desktop client, your account credentials automatically verify your identity, allowing the message to open without requiring a separate passcode.

What should I do if the passcode email never arrives?

First, check your Junk and Spam folders and verify via Outlook on the web. If it's still missing, ask your IT administrator to run a message trace in the Exchange admin center to see if a firewall or spam filter blocked the automated email.

Microsoft Office Security Issues