Users created with PowerShell New-ADUser can't log in - powershell

Question

I have a small problem with the New-ADUser command in powershell.
I'm trying to create a bunch of users from a file, and I can't seem to do it right.
I do create the accounts, but when I try to log into them, it tells me that the "connection method used isn't authorized" (I am sorry if the message isn't exact, the system I'm using isn't in english)
I am using a straight out of the box AD installed on a Windows Server 2012 R2. Everything was left as default for the moment.
The command I'm using is :
for ($i = $BeginLoopAt; $i -le $EndLoopAt; $i++) {
$Id = $WorkSheet.cells.Item($i, 1).text
$FirstName = $WorkSheet.cells.Item($i, 2).text
$LastName = $WorkSheet.cells.Item($i, 3).text
$Country = $WorkSheet.cells.Item($i, 4).text
$Location = $WorkSheet.cells.Item($i, 5).text
$Department = $WorkSheet.cells.Item($i, 6).text
$AccountName = ($FirstName.Substring(0, 1) + $LastName).ToLower()
New-ADUser -Name "$AccountName" -EmployeeID $Id -Country $County -City $Location -Department $Department -GivenName $FirstName -Surname $LastName -Path "$UserPath" -ChangePasswordAtLogon $true -Enabled $true -accountPassword (ConvertTo-SecureString -AsPlainText "Azerty01" -Force) -passThru
Seeing the error, I believed that the error was coming from the fact that I didn't add a -AuthType, but after trying with both options from -AuthType, error wouldn't go away.
It event prints the following error if I choose -AuthType Basic
New-ADUser : The username is not provided. Specify username in ClientCredentials.
At C:\Users\Administrateur\Desktop\script.ps1:132 char:5
+ New-ADUser -Name "$AccountName" -EmployeeID $Id -Country $County -City $Loca ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [New-ADUser], ADException
+ FullyQualifiedErrorId : ActiveDirectoryServer:0,Microsoft.ActiveDirectory.Management.Commands.NewADUser
Well, Basic AuthType seems to be for SSL login, which isn't what *I want
There is close to no difference between properties of users created with Powershell and users created through GUI. (None that I have seen)
But the users created through GUI can log in, while those created by powershell can't.
What did I miss?
Thanks in advance!
EDIT :
After some tests, i realized that, as a matter of fact, i couldn't log in with ANY account created after the AD was installed... Kinda failed before, I thought i created a user named User3 because other names were taken, and I tested with User2 that was there before AD installation...
Meaning, I can only log in accounts that existed before AD DS was installed, and I absolutely don't know why.

Answer 1

Change the line: -ChangePasswordAtLogon $true to -ChangePasswordAtLogon 0

Answer 2

You must specify at least a SAMAccountName (using the -SamAccountName option) before you can login since this is the pre-windows2000 login name which is used in a lot of places in AD (it's also used in some default environment variables of users like %username%).
See https://technet.microsoft.com/en-us/library/ee617253.aspx for the documentation on New-ADUser.