ECS Service stuck on creation - aws-lambda

Question

Trying to deploy a CloudFormation template gets stuck with 'AWS::ECS::Service' stuck on 'CREATE_IN_PROGRESS' with status 'Resource creation Initiated'.
Can anyone please tell me if there's a configuration problem with my CloudFormation template?
How would i troubleshoot this?
CloudFormation Template
Thank you!
"FargateTasksCluster": {
"Type": "AWS::ECS::Cluster"
},
"FargateTasksLogGroup": {
"Type": "AWS::Logs::LogGroup"
},
"MytaskTask": {
"Type": "AWS::ECS::TaskDefinition",
"Properties": {
"ContainerDefinitions": [{
"Name": "my-task",
"Image": "mountainpass/infrastructure:helloworld",
"Environment": [],
"LogConfiguration": {
"LogDriver": "awslogs",
"Options": {
"awslogs-region": {
"Fn::Sub": "${AWS::Region}"
},
"awslogs-group": {
"Fn::Sub": "${FargateTasksLogGroup}"
},
"awslogs-stream-prefix": "fargate"
}
}
}],
"Family": "my-task",
"NetworkMode": "awsvpc",
"ExecutionRoleArn": {
"Fn::Sub": "arn:aws:iam::${AWS::AccountId}:role/ecsTaskExecutionRole"
},
"TaskRoleArn": {
"Fn::Sub": "${IamRoleLambdaExecution}"
},
"RequiresCompatibilities": ["FARGATE"],
"Memory": "0.5GB",
"Cpu": 256
}
},
"MytaskService": {
"Type": "AWS::ECS::Service",
"Properties": {
"Cluster": {
"Fn::Sub": "${FargateTasksCluster}"
},
"LaunchType": "FARGATE",
"ServiceName": "my-task",
"DesiredCount": 1,
"TaskDefinition": {
"Fn::Sub": "${MytaskTask}"
},
"NetworkConfiguration": {
"AwsvpcConfiguration": {
"AssignPublicIp": "DISABLED",
"SecurityGroups": [],
"Subnets": ["subnet-2cc37974", "subnet-3c959d5b", "subnet-49d7d200"]
}
}
}
}