I am logging what appears to be a bug/software defect with Field Maps and Feature Templates.
Problem: I was unable to prepare a map for offline use when the Web Map referenced an empty Feature Layer with no records - and thus no Feature Template.
You will get an immediate failure message when preparing the managed map areas or manually downloading the map areas from the phone.
Solution: Create a new feature (and thus the Feature Template) before preparing your Field Map app for the field. You can delete the point after.
It would be great if this was better documented in online tutorials/help. Thank you
I'm not able to reproduce this using a simple Feature Layer Template from ArcGIS Online.
How are you publishing/creating your layers?
Are there multiple layers/tables in the feature service?
Do your layers have Feature Types or just templates?
These are hosted layers, correct?
What is the exact error message are you seeing?