ResourceInitializationError: unable to pull secrets or registry auth: execution resource retrieval failed: unable to retrieve ecr registry auth: service call has been retried 3 time(s): RequestError

I'm using lambda for "Long running jobs" in a way, described in the link below: Long running jobs in AWS Lambda

Which is working correctly till the lambda triggers the task, but the task fails with the error message: ResourceInitializationError: unable to pull secrets or registry auth: execution resource retrieval failed: unable to retrieve ecr registry auth: service call has been retried 3 time(s): RequestError

I've searched and found several solutions applied them but didn't get the correct answer to sort out my issue, I'm using the public subnet with proper route set with gateway. But still its not working.

I've created the stack using the yaml below:

Resources:
  GetVideoAlphaExecutionRole:
    Type: "AWS::IAM::Role"
    Properties:
      RoleName: GetVideoAlphaExecutionRole
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Principal:
              Service: "ecs-tasks.amazonaws.com"
            Action: "sts:AssumeRole"
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy

  GetVideoAlphaTaskRole:
    Type: "AWS::IAM::Role"
    Properties:
      RoleName: GetVideoAlphaTaskRole
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Principal:
              Service: "ecs-tasks.amazonaws.com"
            Action: "sts:AssumeRole"
      Policies:
        - PolicyName: IAMPolicyGetVideoAlpha
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: Allow
                Action:
                  - "s3:PutObject"
                Resource:
                  - arn:aws:s3:::get-video-alpha-bucket/*

  GetVideoAlphaTaskDefinition:
    Type: "AWS::ECS::TaskDefinition"
    DependsOn: GetVideoAlphaExecutionRole
    Properties:
      ContainerDefinitions:
        - Image: 123445678.dkr.ecr.us-east-1.amazonaws.com/get-video-alpha:latest
          Name: get-video-alpha
      Cpu: 256
      Memory: 512
      RequiresCompatibilities:
        - FARGATE
      NetworkMode: awsvpc
      ExecutionRoleArn: { "Ref": GetVideoAlphaExecutionRole }
      TaskRoleArn: { "Ref": GetVideoAlphaTaskRole }

  GetVideoAlphaCluster:
    Type: "AWS::ECS::Cluster"
    Properties:
      ClusterName: get-video-alpha

  GetVideoAlphaService:
    Type: "AWS::ECS::Service"
    DependsOn: GetVideoAlphaTaskDefinition
    Properties:
      Cluster: { "Ref": "GetVideoAlphaCluster" }
      LaunchType: FARGATE
      ServiceName: get-video-alpha
      DesiredCount: 0
      NetworkConfiguration:
        AwsvpcConfiguration:
          Subnets:
            - subnet-08e9a9531a9a86a8f
          SecurityGroups:
            - sg-08b4ce654be608cf5
          AssignPublicIp: ENABLED
      TaskDefinition: { "Ref": "GetVideoAlphaTaskDefinition" }

Any help to sort this out? Or need any further information, please do let me know.

Thanks.