Could you describe the problem with some more details?
Many issues can be resolved by quitting to the menu and restarting.
The message below reminds me, be sure you have the correct version as there are two trainers for the game now. UPLAY PLUS and Steam + UPlay.
[Edited by Jaks, 12/21/2019 7:53:53 AM]
Numpad 9: Set Ability Points - enter the abilities page and
note your ability points count. Press this to set it
to the value shown in the trainer. You may have to leave
and come back to see it has changed.
I believe you have to at least have 1 earned.