Is your game installed on an external USB drive? Ubi games and externals DO NOT work well together.
Just select a skill that needs it as a requirement, don't buy it just click to highlight or mouse over it and then use the add supplies, its tricky but will eventually do it. you may need to do this for the others as well if it does not pick up on it right away.
[Edited by CyPHeR369, 3/3/2018 5:57:26 PM]