Re-prompt credential box if username/pw is incorrect - powershell

Question

How do you Re-prompt credential box if username/pw is incorrect?
Import-Module ActiveDirectory
Write-Host "Please enter Admin credential..."
$Creds = Get-Credential
My script runs everyline after even putting wrong username/pw (w error obvously)
I need Get-Credential to appear everytime the user/pass is invalid so I won't rerun the same script everytime I put in wrong information.
UPDATE:
Heres the sample script:
Import-Module ActiveDirectory
Write-Host "Please enter Admin credential..."
$Creds = Get-Credential
$Tpm = Get-wmiobject -ComputerName $wsid -Credential $Creds -Namespace ROOT\CIMV2\Security\MicrosoftTpm -Class Win32_Tpm
I need to get the TPM of another computer and will require to enter user/pw to do the job. What I need is to validate if the user/name pw is correct and if not, reprompt the Get-Credentials screen.

Answer 1

You can't validate credential with get-credential, instead you can use a try catch statement against the get-wmiobject, something like
$c=get-credential
try{
gwmi -ComputerName comp1 -Credential $c -Class win32_bios
}
catch [System.UnauthorizedAccessException]{
"wrong credential retry please"
$c=get-credential
}

Answer 2

function Test-Credentials() {
param (
[Parameter(Mandatory = $false)]
[PsCredential]$Creds
)
$IDX = 0 # Retry Limit Counter
$limit = 3 # Retry Limiter
$DS = New-Object System.DirectoryServices.AccountManagement.PrincipalContext('domain')
while (!$DS.ValidateCredentials($Creds.UserName, $Creds.GetNetworkCredential().password) -and ($IDX -lt $limit)) {
$IDX++
Write-Host " - Failed - " -ForegroundColor Yellow
$Creds = Get-Credential -Message "Validaton Failed: Please Re-enter your credentials" -UserName $Creds.UserName
}
return $Creds