Label update returns DUPLICATE_NAME

['Kostas Kougios' via AdWords API and Google Ads API Forum]

Hi,

I am having this issue where I can't update any labels. The update doesn't 
change the label name.

My code is pretty standard I think (scala):

val g = Label.newBuilder
.setName(StringValue.of("Keyword_Coverage_v4.0_Native"))
.setStatus(LabelStatus.valueOf("ENABLED"))
.setResourceName("customers/$ACC/labels/$LABEL_ID")
.build
val fields = FieldMasks.allSetFieldsOf(g)
val op=LabelOperation.newBuilder
.setUpdate(g)
.setUpdateMask(fields)
.build
val client = clientProvider.googleAdsVersion.createLabelServiceClient
client.mutateLabels(account.id.toString,Seq(op).asJava) 

*Keyword_Coverage_v4.0_Native* exists already but I am getting this error:

[error_code {
  label_error: DUPLICATE_NAME
}
message: "Label names must be unique."
trigger {
  string_value: "Keyword_Coverage_v4.0"
}
location {
  field_path_elements {
    field_name: "operations"
    index {
    }
  }
  field_path_elements {
    field_name: "create"
  }
  field_path_elements {
    field_name: "name"
  }
}
,]

Any ideas why?

Thanks

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