My organization has two almost identical web maps on ago.
Each has several editable feature services from my local server.
The web maps are set to allow edits on these layers.
In one web map, I can get the edit dialog to popup, and I can successfully save an edit.
In the other web map, I cannot do this: Instead, I can click edit, hover the mouse over the map,
and although I see the prompt to 'Click to add a point. Press CTRL to enable snapping', nothing happens when I click.
I used ago assistant to ensure that there are no issues with the web map json.
I also verified the source mxd has no issues, reset field order, republished, and the service is ok too.
All is fine with the gdb schema.
See the f12 network pics for the web map that can successfully edit, vs the one that can't.
The f12 console tab showed no errors for either web map.