Hi,
According to this video, it should be possible to publish Geoprocessing Services form ArcGIS Pro to a standalone ArcGIS Server.
The problem is that I do not see the option "Geoprocessing Service" which should be available (I do have admin rights).

I am using ArcGIS Pro 2.7 and ArcGIS Server 10.8.1 (the same problem also occurred with Pro 2.6).
Does anyone have an idea what could cause the issue? Maybe additional extensions need to be installed to make it work? I would be very grateful for suggestions.
Lukas