Chris,
You need to have at least 1 editable feature layer in your map. I would go through the map and check if:
- Editing is disabled on your layers.
- If Editing is disabled on the feature service.
Another thing to potentially check is that if you sign into Collector using a different account than the one used to author the map and the feature layer/feature service that the map and services are shared in a group that the Collector user has access to.
Hope this helps!