Microsoft 365 Error Codes

How to Fix Microsoft Scheduling Poll Cannot Submit Votes (401 Error)

Kushani Nimanthika Sep 25, 2026 869 views

Question details

Participants receive a 401 Unauthorized error and cannot submit votes or propose times in Microsoft Scheduling Poll.

How to Fix Microsoft Scheduling Poll Cannot Submit Votes

Product: Microsoft 365
Device & OS: Windows
Scenario: Internal and external participants attempt to vote on meeting times or propose new times using a Microsoft Scheduling Poll link.
Observed behavior: The browser fails to process the vote submission, and developer tools reveal a 401 Unauthorized response. The issue happens intermittently across multiple browsers and accounts.

Before you start

Verify that your internet connection is stable, and test opening the polling link in an Incognito or InPrivate window to quickly rule out browser cache conflicts before troubleshooting further.

Solution 1Recommended

Check Microsoft 365 Service Health Status

Since the 401 Unauthorized error usually indicates a server-side authentication failure, checking Microsoft's service health is the most critical step.

A 401 error signifies that the Microsoft server is refusing the connection due to an authentication token issue. Because this affects both internal and external users simultaneously, it is almost certainly a broader Microsoft Exchange or server outage rather than an issue with your specific device.

Access the Admin Center

Log into the Microsoft 365 Admin Center using your administrator credentials.

Navigate to Service Health

On the left-hand navigation pane, click on 'Health' and then select 'Service Health'.

Review Active Advisories

Look for any active service degradation reports related to 'Exchange Online' or 'Microsoft Scheduling Poll' to confirm if Microsoft is already addressing the server issue.

Check Microsoft 365 Service Health Status

External Participants: If you are an external participant encountering this error, please contact the meeting organizer so they can check their organization's service health or manually collect your availability.

Solution 2

Use Browser Workarounds to Force New Sessions

While waiting for server-side fixes, bypassing corrupted local tokens can sometimes allow a successful vote submission.

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Frequently Asked Questions

What does a 401 Unauthorized error mean in a Scheduling Poll?

A 401 error means the web server failed to authenticate the user's request. In Microsoft Scheduling Polls, this typically points to a temporary Microsoft-side glitch affecting how the server validates user tokens, particularly for external participants.

Can external participants vote without a Microsoft account?

Yes, Microsoft Scheduling Polls are designed to allow external participants to vote without needing a Microsoft account. If they encounter a 401 error, it is almost always a service disruption rather than a missing permission.

Will clearing my browser cache resolve the voting error?

Sometimes clearing the cache or using an Incognito window resolves the issue if it is caused by a localized, expired session token. However, if multiple users experience the issue simultaneously, it is a broader server problem that Microsoft must fix.

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