PROBLEM
Labels enabled for a hosted feature service using the Create Labels option in ArcGIS Online do not display when the same hosted feature service is accessed in the Collector for ArcGIS application for Android and iOS.
This is a known limit.
To view labels in the Collector for ArcGIS application, label the map in ArcMap instead of ArcGIS Online.
Note: If duplicate labels are present in the tiled map service, refer to the Esri KB article, Problem: Duplicate labels are present for tiled or cached map services in ArcGIS Online
Get help from ArcGIS experts
Download the Esri Support App