Get last login time for guest users in AAD/Entra ID

$guestusers = Get-MgUser -Filter "UserType eq 'Guest'" -All -property signinactivity 
$output = @()

ForEach ($guestuser in $guestusers) {
    $output += New-Object -TypeName PSObject -Prop ([ordered]@{'Mail'=$guestuser.Mail;'LastSignInDateTime'=($guestuser | Select -ExpandProperty SignInActivity).LastSignInDateTime})
}

$output

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