I have a variable nugetVersion to which I assign a value depending on if we’re in master branch or a feature branch, and later on in the Packaging step it won’t be recognized. The pipeline outputs No value was found for the provided environment variable. Here’s my .yml file

trigger:
- master

pool:
  vmImage: ubuntu-latest

variables:
  major: '1'
  minor: '1'
  revision: $[counter(variables['minor'], 1)] # This will get reset every time minor gets bumped.

  group: 'nuget-version-group'
  name: nugetVersion
  ${{ if eq( variables['Build.SourceBranchName'], 'master' ) }}: 
    value: '$(major).$(minor).$(revision)'
  ${{ else }} : 
    value: '$(major).$(minor).$(revision)-$(Build.SourceBranchName)'

steps:
- script: echo $nugetVersion
  displayName: 'Output nugetVersion'
- task: DotNetCoreCLI@2
  displayName: Restoring
  inputs:
    command: 'restore'
    feedsToUse: 'select'
    vstsFeed: '---'

- task: DotNetCoreCLI@2
  displayName: Packaging
  inputs:
    command: 'pack'
    packagesToPack: '**/*.csproj'
    versioningScheme: 'byEnvVar'
    versionEnvVar: nugetVersion

- task: NuGetAuthenticate@1
  displayName: Authenticate

- task: DotNetCoreCLI@2
  displayName: Pushing
  inputs:
    command: 'push'
    packagesToPush: '$(Build.ArtifactStagingDirectory)/*.nupkg'
    nuGetFeedType: 'internal'
    publishVstsFeed: '---'

Before I was using a conditional for the nugetVersion, it would correctly recognize it during the Packaging step. it used to look like this:

variables:
  major: '1'
  minor: '1'
  revision: $[counter(variables['minor'], 1)] # This will get reset every time minor gets bumped.
  nugetVersion: '$(major).$(minor).$(revision)'