MFA Security Issues

Fix SharePoint External Verification Code Delays and Expiration

Nimra Malik Oct 21, 2026 868 views

Question details

The user is experiencing delayed delivery of SharePoint external sharing verification codes, causing them to expire before they can be used, and is wondering if the 15-minute validity period can be extended via Conditional Access settings.

How to Fix SharePoint External Verification Code Delays

Product: Microsoft SharePoint
Device & OS: not provided
Scenario: External users are attempting to access shared SharePoint files but cannot log in because the email containing the verification code arrives after the strict 15-minute validity window has closed.
Observed behavior: Verification emails are delayed, resulting in expired authentication codes and blocked file access. Changing Conditional Access to Report-only mode does not resolve the issue.

Before you start

Before proceeding, ensure that the external user's email client is not delaying incoming messages or routing Microsoft 365 system emails into a spam or quarantine folder.

Solution 1Recommended

Check Microsoft 365 Service Health for Incident Bulletins

The most common cause for delayed verification emails is an active Microsoft 365 service incident (such as MO544665) rather than a local policy misconfiguration.

The 15-minute expiration limit for external sharing codes is a hardcoded security feature in Microsoft 365 that cannot be manually extended. If codes are arriving late, it is almost always due to server-side mail transport delays.

Sign in to the Admin Center

Have your IT administrator log into the Microsoft 365 admin center using their global administrator credentials.

Navigate to Service Health

On the left-hand navigation pane, click on the 'Health' drop-down menu and select 'Service health'.

Review Active Advisories

Check the dashboard for any active advisories or incidents related to Exchange Online, SharePoint Online, or delayed email notifications.

Open a Support Ticket

If no known incidents are listed but the issue persists globally for your tenant, go to 'Support' > 'New service request' to open a ticket with Microsoft.

Check Microsoft 365 Service Health for Incident Bulletins

Conditional Access Report-only Mode: Report-only mode evaluates and logs what a Conditional Access policy would do without actively enforcing it. It cannot be used to bypass security rules or extend the validity period of verification codes.

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Frequently Asked Questions

Can I manually extend the 15-minute expiration limit for SharePoint verification codes?

No. The 15-minute validity period for SharePoint external sharing verification codes is a fixed security measure set by Microsoft and cannot be altered by tenant administrators.

Does Conditional Access Report-only mode affect email delivery times?

No. Report-only mode is solely designed to audit and log the potential impact of a policy on sign-ins. It does not control authentication mechanics, email delivery infrastructure, or code validity durations.

What should an external user do if their SharePoint code has expired?

The external user should click the original shared document link again to trigger a new verification code request. They should keep their email inbox open and refresh it frequently to enter the code as soon as it arrives within the 15-minute window.

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