Trying to setup a new Customer in Partner Center and its broken

Powershell creates them fine

Install-Module -Name PartnerCenter
Connect-PartnerCenter


$newCustomer = New-PartnerCustomer `
  -BillingAddressLine1 "XXXXXX" `
  -BillingAddressCity "XXXX" `
  -BillingAddressState "XXXXX" `
  -BillingAddressPostalCode "XXXX" `
  -BillingAddressCountry "XXXX" `
  -ContactFirstName "XXXX" `
  -ContactLastName "XXXX" `
  -ContactEmail "XXXXX" `
  -ContactPhoneNumber "XXXXX" `
  -Domain "XXXXX.onmicrosoft.com" `
  -Name "XXXXXXXX" `
  -Language "en" `
  -DisableValidation

# Verify credentials exist before proceeding
if ($null -eq $newCustomer.UserCredentials) {
    Write-Warning "WARNING: UserCredentials is null — tenant may have been created but credentials not returned!"
    Write-Host "Customer ID: " $newCustomer.Id
    Write-Host "Check Partner Center immediately and reset the password manually."
} else {
    Write-Host "===== SAVE THESE CREDENTIALS NOW ====="
    Write-Host "Username:    " $newCustomer.UserCredentials.UserName
    Write-Host "Password:    " $newCustomer.UserCredentials.Password
    Write-Host "Customer ID: " $newCustomer.Id
    Write-Host "======================================"
    
    # Also save to a local file as a backup
    $creds = "Username: $($newCustomer.UserCredentials.UserName)`nPassword: $($newCustomer.UserCredentials.Password)`nCustomerID: $($newCustomer.Id)"
    $creds | Out-File -FilePath ".\NewCustomer_Credentials.txt"
    Write-Host "Credentials also saved to .\NewCustomer_Credentials.txt"
}