Dataflow refresh is not working - Workload settings not available

I asked the api about the workloads (https://docs.microsoft.com/en-us/rest/api/power-bi/capacities/getworkloads) and got an error as return value:

{
    "error": {
        "code": "InternalError",
        "pbi.error": {
            "code": "InternalError",
            "parameters": {},
            "details": []
        }
    }
}

This is a critical issue.