ECS Fargate Service Task URL is taking to long too respond

I have deployed my app using AWS ECS and Fargate as a service via CloudFormation template ,it's been nearly two hours but the task's IP is still not accessible. I am using a public ecr repository,public subnets and allowed internet gateway to them. Below is the template i used :

AWSTemplateFormatVersion: 2010-09-09
Description: CloudFormation template for deploying an app using Fargate
Resources:
  Cluster:
    Type: AWS::ECS::Cluster
    Properties:
      ClusterName: !Join ['', [!Ref ServiceName, Cluster]]

  TaskDefinition:
    Type: AWS::ECS::TaskDefinition
    Properties:
      NetworkMode: awsvpc
      RequiresCompatibilities:
        - FARGATE
      Cpu: '4096'
      Memory: '16384'

      ExecutionRoleArn: !GetAtt ExecutionRole.Arn
      TaskRoleArn: !GetAtt TaskRole.Arn
      ContainerDefinitions:
        - Name: !Ref ServiceName
          Image: !Ref Image
          PortMappings:
            - ContainerPort: !Ref ContainerPort
          Essential: true
      EphemeralStorage:
        SizeInGiB: 150

  ExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: !Join ['', [!Ref ServiceName, ExecutionRole]]
      AssumeRolePolicyDocument:
        Statement:
          - Effect: Allow
            Principal:
              Service: ecs-tasks.amazonaws.com
            Action: 'sts:AssumeRole'
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy'

  TaskRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: !Join ['', [!Ref ServiceName, TaskRole]]
      AssumeRolePolicyDocument:
        Statement:
          - Effect: Allow
            Principal:
              Service: ecs-tasks.amazonaws.com
            Action: 'sts:AssumeRole'
  
  FargateService:
    Type: AWS::ECS::Service
    Properties:
      Cluster: !Ref Cluster
      LaunchType: FARGATE
      ServiceName: munlq-service
      DesiredCount: 1
      TaskDefinition: !Ref TaskDefinition
      NetworkConfiguration:
        AwsvpcConfiguration:
          AssignPublicIp: ENABLED
          SecurityGroups:
            - !Ref SecurityGroup
          Subnets:
            - !Ref SubnetA
            - !Ref SubnetB
      DeploymentConfiguration:
        MaximumPercent: 200
        MinimumHealthyPercent: 100
        DeploymentCircuitBreaker:
          Enable: true
          Rollback: true