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Thanks so much. The first command fix it
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Pretty Straightforward:<br />
<br />
$oldSuffix = &quot;&quot;<br />
$newSuffix = &quot;yourdomain.com&quot;<br />
$server = &quot;Yourdomaincontroller&quot;<br />
Get-ADUser -ResultSize Unlimited | ForEach-Object {<br />
$newUpn = $_.UserPrincipalName.Repla<wbr />ce($oldSuf<wbr />fix,$newSu<wbr />ffix)<br />
$_ | Set-ADUser -server $server -UserPrincipalName $newUpn<br />
}<br />
<br />
<br />
ref link: &nbsp;<a href="https://blogs.technet.microsoft.com/canitpro/2015/07/07/step-by-step-changing-the-upn-suffix-for-an-entire-domain-via-powershell/" rel="ugc">https://blogs.technet.microsoft.com/canitpro/2015/07/07/step-by-step-changing-the-upn-suffix-for-an-entire-domain-via-powershell/</a>
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Pretty Straightforward:

$oldSuffix = ""
$newSuffix = "yourdomain.com"
$server = "Yourdomaincontroller"
Get-ADUser -ResultSize Unlimited | ForEach-Object {
$newUpn = $_.UserPrincipalName.Replace($oldSuffix,$newSuffix)
$_ | Set-ADUser -server $server -UserPrincipalName $newUpn
}


ref link:  https://blogs.technet.microsoft.com/canitpro/2015/07/07/step-by-step-changing-the-upn-suffix-for-an-entire-domain-via-powershell/ [https://blogs.technet.microsoft.com/canitpro/2015/07/07/step-by-step-changing-the-upn-suffix-for-an-entire-domain-via-powershell/]

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I need to change the UPN for all users so I can migrate to office 365. I accidentally ran a powershell command on the entire domain instead of the test OU. Now all users UPN is just the @ symbol. When I go to Properties / Accounts, user logon name is correct but instead of the .local or .com domain, I just have the @ Symbol.<br />
<br />
I can not figure out how to replace @ with their internet domain.
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I need to change the UPN for all users so I can migrate to office 365. I accidentally ran a powershell command on the entire domain instead of the test OU. Now all users UPN is just the @ symbol. When I go to Properties / Accounts, user logon name is correct but instead of the .local or .com domain, I just have the @ Symbol.

I can not figure out how to replace @ with their internet domain.

Powershell command to fix UPN

Windows PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and associated scripting language built on the .NET Framework. PowerShell provides full access to the Component Object Model (COM) and Windows Management Instrumentation (WMI), enabling administrators to perform administrative tasks on both local and remote Windows systems as well as WS-Management and Common Information Model (CIM) enabling management of remote Linux systems and network devices.

Powershell

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.