Below are cheat console commands that used to work in previous patches, but result in unrecognized command errors in The White March:

 

addtalent Player_New_Game(Clone)_0 tln_scion_of_flame_talent

AttributeScore Companion_Eder(Clone)_3 might 2

 

Did the syntax for console commands change over the course of patching?

I believe that I experienced data corruption following the installation of the expansion.  After saving/reloading/restarting multiple times, these commands are finally working:

 

addability Companion_GGP(Clone)_3 tln_scion_of_flame_talent

removetalent Companion_GGP(Clone)_3 tln_scion_of_flame_talent