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Fix SharePoint Error: New Site Group Alias Already Exists

Maira Mehtab Sep 20, 2026 869 views

Question details

The user encounters an error during SharePoint site creation where an initially available group alias is later reported as already existing.

Product: Microsoft SharePoint
Device & OS: not provided
Scenario: Creating a new SharePoint site or Microsoft 365 group from the admin portal.
Observed behavior: The system initially shows the group alias as available, but fails to proceed, stating the alias already exists. The user cannot locate any active site or group using that name.

Before you start

Verify if another administrator recently created a site or group with the same alias, as synchronization across Microsoft 365 services can sometimes take several minutes to reflect globally.

Solution 1Recommended

Bypass Browser Caching and Synchronization Delays

Use this solution to ensure that outdated browser cache or temporary Microsoft 365 backend sync delays aren't causing false alias availability checks.

Often, the SharePoint site creation wizard relies on cached browser data to perform initial validation. If a group was recently deleted or created, clearing your local cache or using a private window forces the system to pull the most up-to-date directory information.

Open an Incognito or Private Window

Launch your web browser and open a new Private or Incognito window to ensure no previously cached session data or cookies are loaded during site creation.

Clear browser cache and cookies

If you prefer using your standard browser window, go to your browser's settings, clear the cache and site cookies, and then restart the browser completely.

Retry SharePoint site creation

Log back into Microsoft 365 and attempt to create the SharePoint site again using the exact same alias to see if the backend synchronization has caught up.

Manual URL Check: You can also manually type the expected SharePoint site URL (e.g., yourtenant.sharepoint.com/sites/YourAlias) into the browser to check if a site with that name actually already exists.

Solution 2

Search for Conflicting Microsoft 365 Directory Objects

If the alias truly exists in the backend, it might be assigned to a hidden group or a soft-deleted object. This method helps you locate or avoid the conflict.

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Frequently Asked Questions

Why does SharePoint say my alias is available at first but fail later?

The initial validation check might only query a local or cached subset of the directory for speed. The final creation step, however, verifies against the entire global Microsoft 365 directory where a hidden or deleted group might still hold the alias.

Can a deleted Microsoft 365 group cause an alias conflict?

Yes. When a Microsoft 365 group is deleted, it is kept in a 'soft-deleted' state for 30 days by default. Its alias remains reserved during this retention period and cannot be reused until the group is permanently purged.

How do I find hidden groups using an alias in Microsoft 365?

You can use the Microsoft 365 Admin Center's search functions under 'Teams and Groups', or use Exchange Online PowerShell cmdlets (such as Get-UnifiedGroup) to search the backend for active or soft-deleted groups occupying your desired alias.

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