I am trying to set the variable template to use based on if the branch is dev, release or master using the config below:

variables:
  - template: ../vars/global.yml
  - ${{ if eq( variables.isDev , 'True' ) }}:
      - template: ../vars/dev.yml
  - ${{ if eq( variables.isRelease , 'True' ) }}:
      - template: ../vars/stage.yml
  - ${{ if eq( variables.isMaster , 'True' ) }}:
      - template: ../vars/prod.yml


stages:
  - template: ../stages/build.yml
  - template: ../stages/deploy.yml
    parameters:
      dmEnvironment: $(dmEnvironment)
      environment: $(environment)

But I am getting the error Job Dev: Environment $(dmEnvironment) could not be found. The environment does not exist or has not been authorized for use. So it seems like it’s not recognizing my variable. How can I get it to read the actual value?