Permission & Access Issues

How to Fix SharePoint Unable to Add Guest with Different Email Address

Maira Mehtab Oct 1, 2026 868 views

Question details

Users are unable to add a SharePoint guest account using a new email address because the system continues to suggest the guest's old email address.

How to Fix SharePoint Unable to Add Guest with Different Email Address

Product: Microsoft SharePoint
Device & OS: not provided
Scenario: Attempting to invite an external guest user to a SharePoint site after their email address or domain has changed.
Observed behavior: The new email address fails to validate or display the external-user indicator, while the old email address remains stuck in the autocomplete suggestions. Removing the user from the site does not clear the old profile from the tenant directory.

Before you start

Verify that you have global or tenant administrator permissions in Microsoft 365, as standard SharePoint site administrators do not have the required access to manage tenant-level guest directories.

Solution 1Recommended

Remove and Re-add the Guest User via Management Shell

Use the SharePoint Online Management Shell to completely purge the old guest account from the tenant directory so the new email address can be properly registered.

Because guest user profiles are cached at the tenant level, removing them from a specific SharePoint site is insufficient. You must use PowerShell cmdlets to delete the user from the tenant directory.

Launch Management Shell

Open the SharePoint Online Management Shell on your computer as an administrator.

Connect to SharePoint Admin Center

Run the Connect-SPOService command and log in using your global administrator credentials.

Remove the Old User Profile

Execute the command 'Remove-SPOUser' followed by the parameters for the guest's old email address to clear the cached profile from the directory.

Add the New Email Address

Wait a few moments for the directory changes to propagate, then navigate back to your SharePoint site and invite the guest using their new email address.

Remove and Re-add the Guest User via Management Shell

Tenant Administrator Rights Required: If you are only a SharePoint site administrator, you will not be able to execute the Management Shell commands. You must contact your IT department or global administrator to perform this action.

Solution 2

Open a Microsoft Support Ticket for Backend Cleanup

If removing the user via PowerShell does not clear the autocomplete cache, escalate the issue to Microsoft Support for a backend directory sync.

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Frequently Asked Questions

Why does SharePoint keep suggesting a deleted guest's old email address?

SharePoint caches external user profiles in the overarching tenant directory. Removing a user from a specific site collection only revokes their site access; it does not erase their cached profile from the main tenant directory, which is what populates the autocomplete suggestions.

Can I fix the guest email issue if I am only a site administrator?

No. Site administrators do not have the required permission level to modify or delete profiles in the tenant directory. You must contact a Microsoft 365 global administrator to run the necessary PowerShell commands.

What is the Remove-SPOUser command used for?

Remove-SPOUser is a SharePoint Online Management Shell (PowerShell) cmdlet used by tenant administrators to permanently remove a user or group from a specific SharePoint Online site collection, helping to clear cached credentials and resolve access conflicts.

Document & File Issues