How do I get unique email address and retain other fields - powershell

Question

$AllMeetUsers = $null
[array]$AllMeetUsers = gam report meet user all | ConvertFrom-Csv | Select-Object 'actor.email','id.time'
[array]$result = $AllMeetUsers | ForEach-Object {
$Email = $_.'actor.email'
If (-not([string]::IsNullOrWhiteSpace($Email))) {
$IDTime = $_.'id.time'
$FormatIDTime = Get-date($IDTime) -Format("MM-dd-yy")
[PSCustomObject]#{
Email = $Email
Time = $FormatIDTime
}
}
}
Makes an output table like the following
06-07-21 <Email>
09-29-21 <Email>
06-15-21 <Email>
07-12-21 <Email>
07-20-21 <Email>
07-14-21 <Email>
I would like to remove the full duplicate email address line.
but this line is not working
[array]$result = $result | Sort-Object -Property email | Select-Object time,email -Unique
and
[array]$result = $result | Sort-Object -Property email | Select-Object email -Unique
removes the time field while giving me unique email addresses.
How do I accomplish this?

Answer 1

Use a Dictionnary #{} instead of an array.
$results = #{}
if (-not $results.ContainsKey($Email)) {
$results.Add($Email, [PSCustomObject]#{
Email = $Email
Time = $FormatIDTime
})
}
$results.Values

Answer 2

#MathiasR.Jessen made a good point in the comments and I think my code probably needs a conceptual change. However with the answer I accepted from #Hazrelle above this is how the code came out.
$AllMeetUsers = $null
[array]$AllMeetUsers = gam report meet user all | ConvertFrom-Csv | Select-Object 'actor.email','id.time'
$results = #{}
$AllMeetUsers | ForEach-Object {
$Email = $_.'actor.email'
if (-not $results.ContainsKey($Email) -and -not([string]::IsNullOrWhiteSpace($Email))) {
$IDTime = $_.'id.time'
$FormatIDTime = Get-date($IDTime) -Format("MM-dd-yy")
$results.Add($Email, [PSCustomObject]#{
Email = $Email
Time = $FormatIDTime
})
}
}
$results.values
For more information.
https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_hash_tables?view=powershell-7.1