To display the labels:1. Go to the web map (shared from ArcGIS Pro 1.4) in ArcGIS Online.2. Click a layer with labels > ... > Manage Labels.3. Deselect 'Label Features'.4. Click OK.5. Click a layer with labels > ... > Manage Labels.6. Select 'Label Features'.7. Click OK.8. The labels display in the web application.