Serverless Endpoint Creation Doesn't Work via API

Question

I am trying to create a Serverless Endpoint as outlined in the documentation here.

No matter what platform I try to send the request from it fails with the same error message:

{
  "error": {
    "code": "UserError",
    "message": "Error when parsing request; unable to deserialize request body",
    "details": [],
    "additionalInfo": [
      {
        "type": "ComponentName",
        "info": {
          "value": "managementfrontend"
        }
      },
      {
        "type": "Correlation",
        "info": {
          "value": {
            "operation": "128df3fc69ae065ebc65e39be188c15c",
            "request": "3c447b922622b757"
          }
        }
      },
      {
        "type": "Environment",
        "info": {
          "value": "swedencentral"
        }
      },
      {
        "type": "Location",
        "info": {
          "value": "swedencentral"
        }
      },
      {
        "type": "Time",
        "info": {
          "value": "2024-06-19T17:04:26.5506093+00:00"
        }
      }
    ]
  }
}

I suspect there is something wrong with my request body, but not sure what it might be, since it is based on the API docs, and I tried all the property-value combinations I could think of.

{
    "properties": {
        "authMode": "Key",
        "contentSafety": {
            "contentSafetyStatus": "Disabled"
        },
        "modelSettings": {
            "modelId": "azureml://registries/azureml/models/mistralai-Mistral-7B-Instruct-v01/versions/10"
        }
    },
    "location": "swedencentral",
    "kind": "ServerlessEndpoint",
    "identity": {
        "type": "None"
    }
}

The identity field provided in the API example doesn't work, it says the only supported value is None

Any insights into this would be appreciated!