Skills will not activate if the skill level hasn't been upgraded past 0.
Each skill also has requirements that need to be met for them to activate. They will deactivate if they aren't met at anytime.
For example, with the Rally skill if you are …
When you experience issues like this, you can help us resolve it by providing screenshots and details of where in the game it's happening, and which platform you are using. These can be submitted in a ticket to Customer Care.