Variable expansion not working as expected in Azure DevOps Yaml Pipeline when stages are associated with different variable groups

I receive the error message 'Job Job1: Environment $(environmentName) could not be found. The environment does not exist or has not been authorized for use.' when I run the pipeline below.

trigger:
- main

pool:
  vmImage: ubuntu-latest

stages:
  - stage: Dev
    variables:
      - group: Config.Dev
    jobs:
      - deployment:
        environment: $(environmentName)
        strategy: 
          runOnce:
            deploy:
              steps:
              - checkout: self 
              - task: AzureCLI@2
                inputs:
                  azureSubscription: $(azureSubscriptionName)
                  scriptType: 'bash'
                  scriptLocation: 'inlineScript'
                  inlineScript: |
                    az deployment sub create --location uksouth --template-file main.bicep

  - stage: Prd
    variables:
      - group: Config.Prd
    jobs:
      - deployment:
        environment: $(environmentName)
        strategy: 
          runOnce:
            deploy:
              steps:
              - checkout: self 
              - task: AzureCLI@2
                inputs:
                  azureSubscription: $(azureSubscriptionName)
                  scriptType: 'bash'
                  scriptLocation: 'inlineScript'
                  inlineScript: |
                    az deployment sub create --location uksouth --template-file main.bicep
                

I solved my problem as follows.

It relies upon Environments, Service Connections and Variable Groups being named the same.

azure-pipelines.yml

trigger:
- main

pool:
  vmImage: ubuntu-latest

stages:
  - template: deploy.yml
    parameters: 
      environment: Dev
  - template: deploy.yml
    parameters: 
      environment: UAT
  - template: deploy.yml
    parameters: 
      environment: Prd

deploy.yml

parameters:
  - name: environment
    type: string

stages:
  - stage: ${{parameters.environment}}
    variables:
      - group: Simply.Infrastructure.${{parameters.environment}}    
    jobs:
      - deployment:
        environment: ${{parameters.environment}}
        strategy: 
          runOnce:
            deploy:
              steps:
              - checkout: self 
              - task: AzureCLI@2
                inputs:
                  azureSubscription: ${{parameters.environment}}
                  scriptType: 'bash'
                  scriptLocation: 'inlineScript'
                  inlineScript: |
                    az deployment sub create --location uksouth --template-file main.bicep --parameters "{ \"environmentName\": { \"value\": \"$(environmentName)\" }, \"versionNumber\": { \"value\": \"$(versionNumber)\" } }"

main.bicep

targetScope = 'subscription'

param environmentName string
param versionNumber string

resource resourceGroup 'Microsoft.Resources/resourceGroups@2021-04-01' = {
  name: 'Simply.Infrastructure.${versionNumber}'
  location: 'uksouth'
} 

module vnet './vnet.bicep' = {
  name: 'vnet'
  scope: resourceGroup   
  params: {
    name: 'smplyinf${toLower(environmentName)}${versionNumber}'
  }
}