Turn on Bitlocker after drive is encrypted via script

The story goes:

Offline build from SCCM Offline Key - drive is encrypted but Bitlocker is not turned on.

My script is sort of doing the job but I am having trouble with the  $?  command.

It is accepting every last command as  $True  thus keep producing new Recovery Keys into AD.

Any help is appreciated (not sure if this question is for this  PowerShell Forum or W10 Security)

# Initialise Log Path
if (!(Test-Path -path $LogFilePath)){
    New-Item -Type Directory -Path $LogFilePath
}
$encryption_check_all =@()
$encryption_check_all = Get-BitLockerVolume -ErrorAction SilentlyContinue 
       (($encryption_check_all.MountPoint -eq 'C:') -and ($encryption_check_all.protectionStatus -eq 'off')) 
          if($? -ne $True){
               echo "$timeStamper  Bitlocker on C: drive - is turned OFF" | out-file -append $LogFileFullPath
               echo "$timeStamper  Bitlocker on C: drive - is initialising" | out-file -append $LogFileFullPath
                   Enable-BitLocker -MountPoint $env:SystemDrive -TpmProtector -UsedSpaceOnly -SkipHardwareTest  -ErrorAction SilentlyContinue | out-file -append $LogFileFullPath
                   Add-BitlockerKeyProtector -MountPoint $env:SystemDrive -RecoveryPasswordProtector  -ErrorAction SilentlyContinue | out-file -append $LogFileFullPath
                   manage-bde.exe -protectors -enable C: | out-file -append $LogFileFullPath
                          }
else
    {
     echo "$timeStamper  Bitlocker on C: drive is ALREADY Turned ON" | out-file -append $LogFileFullPath
    } 
$encryption_check_all2 =@()
$encryption_check_all2 = Get-BitLockerVolume -ErrorAction Stop 
       (($encryption_check_all2.MountPoint -eq 'C:') -and ($encryption_check_all2.protectionStatus -eq 'on')) 
          if($? -eq $True) {echo "$timeStamper  Bitlocker on C: drive is CONFIRMED Turned ON" | out-file -append $LogFileFullPath
                 } 

Maelito