ECS Service connect could not resolve host

Hello. I've been looking into using ECS Service connect for one of the projects. I've configured ECS service with Service connect functionality but when I try to connect to it from other service in the same namespace I get curl: (6) Could not resolve host: core

Service configuration

"serviceConnectConfiguration": {
    "enabled": true,
    "namespace": "arn:aws:servicediscovery:us-east-1:***:namespace/ns-awd3wsdifs2nsrla",
    "services": [
        {
            "portName": "core",
            "discoveryName": "core",
            "clientAliases": [
                {
                    "port": 80,
                    "dnsName": "core"
                }
            ]
        }
    ]
},
"serviceConnectResources": [
    {
        "discoveryName": "core",
        "discoveryArn": "arn:aws:servicediscovery:us-east-1:***:service/srv-rirfgcxi4bpplqyj"
    }
]

Curl results

curl -v http://core:80
* Could not resolve host: core
* Closing connection 0
curl: (6) Could not resolve host: core

curl -v http://core.skc:80
* Could not resolve host: core.skc
* Closing connection 0
curl: (6) Could not resolve host: core.skc

Source service config

"serviceConnectConfiguration": {
    "enabled": true,
    "namespace": "arn:aws:servicediscovery:us-east-1:***:namespace/ns-awd3wsdifs2nsrla",
    "services": [
        {
            "portName": "admin",
            "discoveryName": "admin",
            "clientAliases": [
                {
                    "port": 77,
                    "dnsName": "admin"
                }
            ]
        }
    ]
},
"serviceConnectResources": [
    {
        "discoveryName": "admin",
        "discoveryArn": "arn:aws:servicediscovery:us-east-1:***:service/srv-niqcn3ec7jgsz27i"
    }
]

VPC has DNS and DNS hostnames enabled

{
    "VpcId": "vpc-00bdb82e8d17a444a",
    "EnableDnsSupport": {
        "Value": true
    }
}

{
    "VpcId": "vpc-00bdb82e8d17a444a",
    "EnableDnsHostnames": {
        "Value": true
    }
}

What am I missing? Thank you.