I saw that it is not possible to publish to ArcGIS Server from ArcGIS Pro :
https://community.esri.com/thread/117751#comment-443432
On the side arcpy, when looking arcpy function "CreateWebLayerSDDraft" it is indicated :
Currently support only hosted service for AGOL
"Currently" suggests that will happen... Is it true?
Otherwise it is possible by another way with arcpy?
Thanks,
Flavie