Get-DanglingDnsRecords fails with: Attempted to divide by zero

[lassehastrup]

Describe the bug When running Get-DanglingDnsRecords with the switch '-FetchDnsRecordsFromAzureSubscription' using a service connection through Azure DevOps we see the error: 'Attempted to divide by zero' for multiple customers, but not everyone.

Reproduce

Create a pipeline to run the code from using a Service connection with full read permissions on the intermediate management group in Azure.

It should use the 'FetchDnsRecordsFromAzureSubscription' switch to do so.

Expected behavior

We expect it to output a hash table and CSV-files, as this works as expected when running it locally.

Screenshots

VERBOSE: Exporting function 'New-AzResourceGraphQuery'.
VERBOSE: Exporting function 'Remove-AzResourceGraphQuery'.
VERBOSE: Exporting function 'Update-AzResourceGraphQuery'.
VERBOSE: Exporting function 'Test-DotNet'.
VERBOSE: Exporting function 'Preload-Assembly'.
VERBOSE: Exporting cmdlet 'Search-AzGraph'.
VERBOSE: Importing cmdlet 'Search-AzGraph'.
VERBOSE: Importing function 'Get-AzResourceGraphQuery'.
VERBOSE: Importing function 'New-AzResourceGraphQuery'.
VERBOSE: Importing function 'Remove-AzResourceGraphQuery'.
VERBOSE: Importing function 'Update-AzResourceGraphQuery'.
VERBOSE: Sent top=100 skip=0 skipToken=
VERBOSE: Received results: 1
Get-DanglingDnsRecords: /agent/_work/1/s/management/src/powershell/private/Get-DanglingCNameRecord.ps1:21
Line |
  21 |  … rdsOutput = Get-DanglingDnsRecords -FetchDnsRecordsFromAzureSubscript …
     |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     | Attempted to divide by zero.

##[error]PowerShell exited with code '1'.
##[error]PowerShell wrote one or more lines to the standard error stream.

Environment- if applicable

Task         : Azure PowerShell
Description  : Run a PowerShell script within an Azure environment
Version      : 5.243.7

Logs- if applicable

Additional context

The weird part it, that we've seen it working, and we've seen it failing (mostly fail). It seems to be some unhandled logic in the code.

[github-actions[bot]]

Message that will be displayed on users' first issue

[shabaz-github]

@abhijeetgaiha / @tanviohri - Hello Team, Please take a look at this issue.