Sometimes it is neccesary to remove Office 365 accounts and then recreate them. For example if a Azure AD guest user account has been created with the wrong account type.

The following powershell script will generate a list of users in the Deleted Users section (https://portal.office.com/adminportal/home#/deletedusers) and allow one to be easily selected to be removed - as there is no option for this in the admin center.

# Remove deleted user from Office365 Recycle Bin

Param( 
    [Parameter(Position=0, Mandatory=$false, ValueFromPipeline=$true)] 
    [string] $username
) 

$test=Get-MsolDomain -ErrorAction SilentlyContinue
if($?)
{
	Write-Host "Already connected to MSOL" -foreground green
}
else
{
	Write-Host "Connecting to MSOL" -foreground yellow
    Connect-MsolService
}

if ($username -eq "") {
	$user = Get-MsolUser -ReturnDeletedUsers | select UserPrincipalName,DisplayName,UserType,SoftDeletionTimestamp | sort SoftDeletionTimestamp -Descending | Out-Gridview -PassThru -Title "Select User to remove from Recycle Bin (Esc to abort)"
} Else {
	$user = Get-MsolUser -UserPrincipalName $username
}
if ($user -ne $null) {
   Write-Host "Removing user"$user.UserPrincipalName"from recycle bin" -foreground green
   $user | Remove-MsolUser -RemoveFromRecycleBin -Force
} Else {
   Write-Host "No user selected. Aborting." -foreground red
}