It means your source is unavailable right now. That could be that the data is disconnected or the service URL changed on the backend. You can try opening the webmap in AGOL and making sure the layer is connected and working- and then resave the map. Then try reopening OD and see if it comes in.
The map may be working fine, but the data layer within it is not. There's a couple of things you can check: 1. See if the same problem is reproducible in a new ops view. 2. Go to the Item details page for your webmap in your organization and see if the link to the data source works there.
Hi Mira - any luck getting this fixed? I am having the same issue; feature service is working fine in web map but not available in widget configuration.
Any help is greatly appreciated-
For above shown layer user connection don't have an access to read/view,
Check for layer connection and feature permissions