Welcome to the community, @vivien!
Did you change your formula after setting up the automation?
If so, you will need to re-test your automation’s trigger step, in order for you to see the current fields & current field values in your automation action steps.
(This is just for the purposes of seeing current values while you are setting up your automation. But even if you don’t re-test the trigger, the automation will still pull in current values when it actually runs.)