You are sharing a sync-enabled feature service and the nonversioned archive-enabled dataset does not have replica tracking enabled. If you intend to use the feature service in a bidirectional collaboration between ArcGIS Enterprise and ArcGIS Online, the layers in the feature service must have replica tracking enabled.
The count in the warning message indicates how many nonversioned archive-enabled layers in your map do not have replica tracking enabled.
Solutions
Do one of the following:
- If you do not intend to use this feature service in a bidirectional collaboration, you don't have to do anything.
- If you intend to use this feature service in a bidirectional collaboration with ArcGIS Enterprise, the layers in the feature service must have replica tracking enabled.
- Run the Enable Replica Tracking geoprocessing tool on all nonversioned archive-enabled datasets in the map. You must close the project or remove the layers from the map before you can run the Enable Replica Tracking tool; their presence in the map causes the feature classes to be locked, which blocks the tool from adding the fields it needs to the feature class.