Add bulk credentials in bulk to Password Vault - powershell

Question

Overview:
I have created a vault that stores sensitive data, you can see my full sample code in this question:
PowerShell Password Vault
Goal:
I am attempting to make a function that would add credentials in bulk. I am not looking for particular method. However, I did attempt to run a loop that would add creds on each new line. But, my logic is off somewhere, meaning that when I attempt to use the following code, it begins to add credentials in an erroneous manner- please see table below. I am very open to new ideas or suggestions as well.
Exact Code:
function Add-BulkCreds{
param(
[string]$ID,
[string]$Key,
[string]$URL
)
$vaultAssembly
do{
Write-Host 'AddCreds)' -ForegroundColor Yellow -NoNewline
$x = Read-Host
$first,$second,$third = $x -split '\s',3
$vault = New-Object Windows.Security.Credentials.PasswordVault
$cred = New-Object Windows.Security.Credentials.PasswordCredential($second, $third, $first)
$vault.Add($cred)
}while($x)
}
Example input:
PS > Add-BulkCreds
AddCreds)test1c1 test1c2 test1c3
test2c1 test2c2 test2c3
test3c1 test3c2 test3c3
AddCreds)
New-Object : Exception calling ".ctor" with "3" argument(s): "The parameter is incorrect.
Cannot create credential"
At C:\Users\getcred.ps1:83 char:13
+ $cred = New-Object Windows.Security.Credentials.PasswordCredential($second, ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [New-Object], MethodInvocationException
+ FullyQualifiedErrorId : ConstructorInvokedThrowException,Microsoft.PowerShell.Commands.NewObjectCommand
Output:
ID Key Endpoint
-------- ------ -----------
test1c3... test1c1 test1c2
Closer Look at ID column:
PS > $credexample.id | Where-Object {$_.key -eq 'test1c1'}
test1c3
test2c1 test2c2 test2c3
test3c1 test3c2 test3c3
Observation:
As you can see the following part of my input was added to my ID column:
test1c3
test2c1 test2c2 test2c3
test3c1 test3c2 test3c3
Whereas....
test1c1 was added to Key
test1c2 was added to endpoint
Question:
Given my goal and overview, how can I create a simple, yet efficient function for adding credentials in bulk? And, does my logic work?
Additionally:
I am realizing that the original parameters aren't even needed since I am splitting the variable below with $x.
param(
[string]$ID,
[string]$Key,
[string]$URL
)