AWS docker container is not inheriting the host instance role - amazon-web-services

Question

I am trying to access S3 bucket from a Camel Router running in docker container deployed in ECS.
Host EC2 instance has IAM policies which provide access to S3 bucket and I have verified this by running a standalone router directly in EC2. But when I tried the program inside a container it is throwing an exception stating that "Access Denied" to S3 bucket.
After this, I tried providing a Task IAM Role by adding TaskRoleArn in my Cloudformation but that didn't help, still the same exception.
Not sure if I am missing anything here, any suggestions?
[Edit, adding the IAM policy here]
This is my IAM policy for host, similar one I created for Task Role as well with the trust relationship to ‘ecs-tasks.amazonaws.com’
This is my IAM policy for host, similar one I created for Task Role as well with the trust relationship to ‘ecs-tasks.amazonaws.com’
EC2Role:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Statement:
- Effect: Allow
Principal:
Service:
- ec2.amazonaws.com
- ecs.amazonaws.com
Action:
- sts:AssumeRole
Path: /Developer/
Policies:
- PolicyName: ecs-service
PolicyDocument:
Statement:
- Effect: Allow
Action:
- logs:CreateLogStream
- logs:CreateLogGroup
- logs:DescribeLogGroups
- logs:DescribeLogStreams
- logs:PutLogEvents
- logs:GetLogEvents
- logs:FilterLogEvents
Resource: '*'
- PolicyName: ep-bucket-policy
PolicyDocument:
Statement:
- Sid: bucket1
Effect: Allow
Action:
- s3:GetObject
- s3:GetObjectAcl
- s3:AbortMultipartUpload
- s3:GetObjectTagging
- s3:DeleteObject
- s3:ListMultipartUploadParts
Resource: *
- Sid: bucket2
Effect: Allow
Action: s3:ListObjects
Resource: "*"
- PolicyName: ep-ecr-policy
PolicyDocument:
Statement:
- Sid: ecr1
Effect: Allow
Action:
- ecr:BatchCheckLayerAvailability
- ecr:GetDownloadUrlForLayer
- ecr:GetRepositoryPolicy
- ecr:DescribeRepositories
- ecr:ListImages
- ecr:BatchGetImage
Resource:
- !Sub 'arn:aws:ecr:${AWS::Region}:${AWS::AccountId}:repository/*’
- Sid: ecr2
Effect: Allow
Action:
- ecr:GetAuthorizationToken
Resource: '*'
- PolicyName: ep-ecs-policy
PolicyDocument:
Statement:
- Sid: ecs1
Effect: Allow
Action:
- ecs:SubmitTaskStateChange
- ecs:RegisterContainerInstance
- ecs:SubmitContainerStateChange
- ecs:DeregisterContainerInstance
Resource: !Sub 'arn:aws:ecs:${AWS::Region}:${AWS::AccountId}:cluster/Custom-*’
- Sid: ecs2
Effect: Allow
Action:
- ecs:Poll
- ecs:DiscoverPollEndpoint
- ecs:StartTelemetrySession
- ecs:CreateCluster
Resource: "*"