Permission & Access Issues

Fix: Coworker Appears as a Guest in a Shared Excel Workbook

Chanuka Geekiyanage Oct 13, 2026 873 views

Question details

The user needs to understand why a coworker shows up with a guest label or an unrecognizable identifier when co-authoring a shared Excel file, and how to fix this display issue.

Why Does a Coworker Appear as a Guest in a Shared Excel Workbook?

Product: Microsoft Excel
Device & OS: not provided
Scenario: Collaborating and co-authoring on a shared Excel workbook.
Observed behavior: Coworkers appear as 'Guest' or with unfamiliar identifiers instead of their actual names and accounts.

Before you start

Confirm whether the shared Excel workbook link was generated using the 'Anyone with the link' setting or restricted to specific organizational accounts.

Solution 1Recommended

Ensure Coworkers Sign In with the Correct Organizational Account

The most common reason for a 'Guest' label is that the user is editing the workbook while signed out or using a personal Microsoft account rather than the authorized work account.

When a user accesses a shared file without being authenticated into the exact account that was granted permission, Excel treats them as an anonymous guest to protect data privacy.

Check current sign-in status

Ask your coworker to open Excel and look at the top right corner of the application to see which profile is currently active.

Sign out of incorrect accounts

If they are signed in with a personal account or an incorrect organizational account, have them click their profile picture and select 'Sign out'.

Sign in with the authorized account

Instruct them to sign back in using the specific organizational Microsoft account that was originally granted access to the workbook.

Ensure Coworkers Sign In with the Correct Organizational Account

Account Verification: Once signed in with the correct account, the coworker's actual name will replace the 'Guest' label in the collaboration interface.

Solution 2

Restrict Sharing Link Permissions to Specific People

If you shared the workbook using an 'Anyone with the link' setting, anyone accessing it without signing in will appear as a guest. Changing this setting forces users to log in.

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Frequently Asked Questions

Why does it say Guest when I share an Excel file?

When an Excel file is shared using an 'Anyone with the link' setting, users who open the link without signing in to a Microsoft account are automatically assigned a 'Guest' label by the system to maintain anonymity.

Can coworkers edit a shared Excel file without signing into an account?

Yes. If the workbook is shared via an 'Anyone with the link can edit' permission, recipients do not need to sign in to access and edit the document. However, they will appear anonymously as guests.

How do I force users to sign in before editing my shared workbook?

You can enforce user sign-ins by changing the sharing link settings from 'Anyone with the link' to 'Specific people' or 'People in your organization.' This ensures only authenticated users can view or edit the file.

Document & File Issues