Deploy image is failing in AKS deploy stage

Build and deploy image stages are passing and I Can see image got pushed to ACR but when I see logs from pod I am seeing following error :

error:

    DownwardAPI:             true
QoS Class:                   BestEffort
Node-Selectors:              <none>
Tolerations:                 node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                             node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
  Type     Reason     Age                From               Message
  ----     ------     ----               ----               -------
  Normal   Scheduled  83s                default-scheduler  Successfully assigned default/aks-agent-deployment-7c77d9996f-6jdqq to aks-sdf-30362432-vmss000000
  Normal   Pulling    82s                kubelet            Pulling image "acrnnn.azurecr.io/aksimage:v1"
  Normal   Pulled     56s                kubelet            Successfully pulled image "acrnnn.azurecr.io/aksimage:v1" in 25.517s (25.517s including waiting). Image size: 262508845 bytes.
  Normal   Created    42s (x3 over 56s)  kubelet            Created container: azp-agent
  Normal   Started    42s (x3 over 56s)  kubelet            Started container azp-agent
  Normal   Pulled     42s (x2 over 53s)  kubelet            Container image "acrnnn.azurecr.io/aksimage:v1" already present on machine
  Warning  BackOff    26s (x3 over 52s)  kubelet            Back-off restarting failed container azp-agent in pod aks-agent-deployment-7c77d9996f-6jdqq_default(dcea6c49-f3a2-41ab-b3d6-22b6563143ce)

and below is the pipeline used:

trigger:
- none

variables:
  imageName: 'aksimage'
  dockerfilePath: 'Dockerfile'
  buildContext: '.'
  acrLoginServer:: 'acrnnn.azurecr.io'
  dockerRegistryServiceConnection: 'april28acr'

parameters:
- name: testtag
  displayName: 'Tag to Build and Deploy'
  type: string
  default: 'latest'

pool:
  vmImage: 'ubuntu-latest'

stages:
- stage: Build
  displayName: Build and Push Docker Image
  jobs:
  - job: BuildJob
    steps:
    - checkout: self

    - task: Docker@2
      displayName: 'Build and Push Docker Image to ACR'
      inputs:
        containerRegistry: '$(dockerRegistryServiceConnection)' # <- not hardcoded 'scn'
        repository: '$(imageName)'    # just aksimage
        command: 'buildAndPush'
        Dockerfile: '$(dockerfilePath)'
        buildContext: '$(buildContext)'
        tags: |
          ${{ parameters.testtag }}  



    - task: PublishPipelineArtifact@1
      displayName: 'Publish deployment.yaml as Artifact'
      inputs:
        targetPath: '$(Build.SourcesDirectory)/deployment.yaml'
        artifactName: 'deployment-files'

# ========================
# 🚀 DEPLOY STAGE
# ========================
- stage: Deploy
  displayName: Deploy to AKS
  dependsOn: Build
  condition: succeeded()
  jobs:
  - job: DeployJob
    displayName: Deploy Using Updated Deployment.yaml
    steps:
    - checkout: self

    - task: DownloadPipelineArtifact@2
      displayName: 'Download Deployment Artifact'
      inputs:
        artifactName: 'deployment-files'
        targetPath: '$(Build.SourcesDirectory)/deployment'

    - task: Bash@3
      name: ShowImageBeforeDeploy
      displayName: 'Show Image Before Tag Replace'
      inputs:
        targetType: 'inline'
        script: |
          set -e
          echo "✅ Image before replacement:"
          grep "image:" $(Build.SourcesDirectory)/deployment.yaml

    - task: Bash@3
      name: ReplaceTag
      displayName: 'Replace Image Tag'
      inputs:
        targetType: 'inline'
        script: |
          set -e
          echo "🔧 Replacing __IMAGETAG__ with '${{ parameters.testtag }}'..."
          sed "s|__IMAGETAG__|${{ parameters.testtag }}|g" $(Build.SourcesDirectory)/deployment.yaml > $(Build.SourcesDirectory)/updated-deployment.yaml

    - task: Bash@3
      name: ShowImageAfterDeploy
      displayName: 'Show Image After Tag Replace'
      inputs:
        targetType: 'inline'
        script: |
          set -e
          echo "✅ Image after replacement:"
          grep "image:" $(Build.SourcesDirectory)/updated-deployment.yaml

    - task: Kubernetes@1
      displayName: 'Deploy to AKS Cluster'
      inputs:
        connectionType: 'Kubernetes Service Connection'
        kubernetesServiceEndpoint: 'april28aks'
        namespace: 'default'
        command: 'apply'
        useConfigurationFile: true
        configuration: '$(Build.SourcesDirectory)/updated-deployment.yaml'
        secretType: 'dockerRegistry'
        containerRegistryType: 'Azure Container Registry'

Please suggest.