Erik Kostson
Ansys Employee

first of all I would use workbench to check the nodal force - it can be done inside workbench mechanical (no need for apdl) with a user defined result called FX (or FY or FZ or FSUM or FVECTORS). These are nodal forces (like you obtained inside APDL), and will of course only be there when we restrain a node , so where we apply a load/force there is no reaction, and hence no nodal force there. To get those we also need to set nodal forces to yes under analysis settings and output controls in mechanical.

For contact forces use the force reaction probe inside workbench mechanical and scope it to the contact region in question, we will though get the total sum.
To get the distribution of the contact force on the underlying nodes one can use perhaps the elemental nodal forces on the contact region. The user defined result inside workbench mechanical is ENFOX,ENFOY, ..ENFOVECTORS, and can be scoped to the edge or surface where the contact is. Then we can export a text file and sum all the forces in excel, like shown here. I have never used this for contacts though so I am not sure how well it works so I would recommend to just use the reaction probe and get the sum:

All the best