Labels work in WAB DE but not in deployed site

kenbuja

I want to show labels for a Feature Layer (this._layerSPGrid) that I've added to the map. I use this code to add them

    var label = new TextSymbol();
    label.color.setColor(new Color('black'));
    label.font.setSize('8pt');
    label.font.setFamily("arial");
    var json = {
      labelExpressionInfo: { value: '{' + this._fieldPriority + '}' }
    }
    var labelClass = new LabelClass(json);
    labelClass.symbol = label;
&nbsp;&nbsp;&nbsp; this._layerSPGrid.setLabelingInfo([labelClass]);<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>