In Explorer for ArcGIS (IOS), the error, "Unable to Open Map, Invalid response" is returned when opening a mobile map package that contains a vector tile package with point features that have labels and unique value symbology.

Workaround

1. Add the feature class twice.
2. Configure the first feature class to use single symbol symbology and labels.
3. Set the symbology to no color with no border so the feature class is not visible. Use unique values for the second feature class.

The vector tile package consist of only a layer, therefore does not look messy in the table of contents or legend.

Steps to Reproduce