When I create an feature class I always get the Warning 000728: The object Id. field does not exist in the table. I don't know what that means or if it affects my feature class at all. But how do I fix it?
How are you creating the feature class in ArcGIS Pro? In the Catalog Pane and a right-click on the geodatabase->New->Feature Class or using the Create Feature Class GP tool?
I do the first thing, the Catalog panel.
Would you able to test the workflow using the Create Feature Class geoprocessing tool to see if it "errors" out with the same error message?