Creating a Service Connector via the CLI threw an unexpected error (not clear enough for a user to correct)

### Describe the bug

I was able to create a service connector via the Azure Portal, but I expected this to work. The error was not clear enough for me to know what to do to resolve the issue:

```bash
az aks connection create keyvault --connection my_connection_name --resource-group my-rg1 --name aks-cluster-name --target-resource-group my-rg1 --vault my-akv1 --enable-csi --client-type none
# cli.azure.cli.core.azclierror: (GeneralUserError) Execution failed. Operation returned an invalid status code 'Conflict'
# Code: GeneralUserError
```

### Related command

`az aks connection`

### Errors

```
# cli.azure.cli.core.azclierror: (GeneralUserError) Execution failed. Operation returned an invalid status code 'Conflict'
# Code: GeneralUserError
```

### Issue script & Debug output

No script needed.

### Expected behavior

A clear error that indicates how I can resolve the issue.

### Environment Summary

az version
{
"azure-cli": "2.65.0",
"azure-cli-core": "2.65.0",
"azure-cli-telemetry": "1.1.0",
"extensions": {
"interactive": "1.0.0b1",
"scenario-guide": "0.1.1"
}
}

### Additional context

_No response_