Computed member expression works on 7.2.6 but fails on 5.1

This code works well on PowerShell Core 7.2.6. Why does it fail on Windows PowerShell 5.1?

PS C:\Users\lit\bin> Get-Content -Path .\Get-ADPasswordExpirationDate.ps1
[CmdletBinding()]
Param(
    [Parameter(Mandatory=$false, Position=0)]
    [string[]]$UserNames = @($Env:USERNAME)
)

Write-Verbose "Getting password expiration date for user $UserNames"

ForEach ($UserName in $UserNames) {
     Get-ADUser -identity $UserName –Properties "DisplayName", "msDS-UserPasswordExpiryTimeComputed" |
          Select-Object -Property `
               @{Name='UserName';Expression={$_.SamAccountName}},
               "Displayname",
               @{Name='Email';Expression={$_.UserPrincipalName}},
               @{Name="ExpiryDate";Expression={[datetime]::FromFileTime($_."msDS-UserPasswordExpiryTimeComputed")}}
}

PS C:\Users\lit\bin> .\Get-ADPasswordExpirationDate.ps1
At C:\Users\lit\bin\Get-ADPasswordExpirationDate.ps1:15 char:112
+ ... {[datetime]::FromFileTime($_."msDS-UserPasswordExpiryTimeComputed")}}
+                                                                      ~~~~
The string is missing the terminator: ".
At C:\Users\lit\bin\Get-ADPasswordExpirationDate.ps1:9 char:35
+ ForEach ($UserName in $UserNames) {
+                                   ~
Missing closing '}' in statement block or type definition.
    + CategoryInfo          : ParserError: (:) [], ParseException
    + FullyQualifiedErrorId : TerminatorExpectedAtEndOfString

PS C:\Users\lit\bin> $PSVersionTable.PSVersion.ToString()
5.1.19041.1682