🪲 Bug Report - Error comparing NIC backend pool memberships () to basicLBBackendIds ().

[infrapmi]

Describe the bug

When trying to run a validate upgrade on a basic LB with no back end pools I get the following error message:

Write-Error: 2024-12-16T20:27:34+00 [Error]:[Test-SupportedMigrationScenario] Error comparing NIC backend pool memberships () to basicLBBackendIds (). Error: Cannot bind argument to parameter 'DifferenceObject' because it is null.

To Reproduce

Steps to reproduce the behavior:

1. Open azure powershell. Install Module for basicloadbalancer upgrade.
2. Select Subscription with basic loadbalancer.
3. Run Command to validate migration of specific loadbalancer:
4. Start-AzBasicLoadBalancerUpgrade -ResourceGroupName fnodeveus06-rg -BasicLoadBalancerName fnodeveus0-loadbalancer -validateScenarioOnly

Expected behavior

A clear and concise description of what you expected to happen without this bug 🙂

Screenshots 📷

If applicable, add screenshots to help explain your problem. Please feel free to blur/cover any sensitive information.

Additional context - please include:

• Version of the AzureBasicLoadBalancerUpgrade module you are running (see: Get-Module AzureBasicLoadBalancerUpgrade after importing the module.)
  ModuleType Version PreRelease Name ExportedCommands

---

Script 2.4.14 AzureBasicLoadBalancerUpgrade Start-AzBasicLoadBalancerUpgrade

• Version of PowerShell you are running ($PSVersionTable)
  Name Value

---

PSVersion 7.4.5
PSEdition Core
GitCommitId 7.4.5
OS CBL-Mariner/Linux
Platform Unix
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0

• The JSON View or template of the VMSS and Load Balancer(s) to be migratedExportedTemplate-fnodeveus06-rg.zip

[mbrat2005]

I'm able to repro this--shouldn't be long to fix. A workaround would be commenting out that test, since you don't care about backend pool membership if the pools don't exist :)