Here is the error message I get:
It says "Overwrite Web Layer
The web feature layer cannot be overwritten if Sync is enabled and replicas are created"
I checked and Sync is not enabled
And I do not have replicas, though I can create replicas in my REST services page:
I am not sure what to do besides delete my service and try again. I saw this thread: AGOL replica removal
But, he found replicas and deleted them. Has anyone seen this before?