EMR on EKS: managed endpoint terminates without any useful clue

I am trying to get an EMR Studio running on an existing EKS cluster by following the instructions here: https://docs.aws.amazon.com/emr/latest/ManagementGuide/emr-studio-create-eks-cluster.html Most of those steps went smoothly, but the issue occurred when I tried to create a managed endpoint with the following command:

aws emr-containers create-managed-endpoint --name [ENDPOINT_NAME] --virtual-cluster-id [VIRTUAL_CLUSTER_ID] --type JUPYTER_ENTERPRISE_GATEWAY --release-label emr-6.2.0-latest --execution-role-arn [EXECUTION_ROLE_ARN] --certificate-arn [CERTIFICATE_ARN]

The endpoint has been created, it stayed in CREATING status for a few minutes, then it terminated, without giving any clues what might be the problem. The result of listing the endpoints is the following:

{
            "id": "2w5v7j307hut1",
            "name": "ENDPOINT_NAME",
            "arn": "ENDPOINT_ARN",
            "virtualClusterId": "VIRTUAL_CLUSTER_ID",
            "type": "JUPYTER_ENTERPRISE_GATEWAY",
            "state": "TERMINATED_WITH_ERRORS",
            "releaseLabel": "emr-6.2.0-latest",
            "executionRoleArn": "EXECUTION_ROLE_ARN",
            "certificateArn": "CERTIFICATE_ARN",
            "createdAt": "2022-05-09T19:58:21+00:00",
            "stateDetails": "Unknown",
            "failureReason": "INTERNAL_ERROR",
            "tags": {}
        },

Could anyone give some suggestions how to troubleshoot this? Is there a way to access logs to figure out what could be wrong?

Thanks a lot! Simon