I'm having trouble downloading web maps published using ArcGIS Pro to collector. The maps appear and are fully functional, but when I attempt to download them to take them offline The download fails with an error message of "unknown".
I have enabled sync, and editing on the feature layer and enabled offline mode for the map.
The most interesting detail is that I can then open the map up in ArcGIS Online, and simply click save and the download features are fully functional. Something must be the issue with ArcGIS Pro and the publishing of the webmap.