Adding a Variable Cost

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This is extra but I added a selection for the enemy like so to go off at the same time:

public struct MPSelectionInfo
    {
        public int MPAvailable;
        public int enemyMPAvailable;
        public Action<int> callback;
        public Action<int> enemyCallback;
    }

public void RequestMPCost(Action<int> callback, Action<int> enemyCallback)
    {
        if (OnMPSelectionNeeded == null)
        {
            callback?.Invoke(0);
            enemyCallback?.Invoke(0);
            return;
        }
        if (TurnSystem.Instance.IsPlayerTurn())
        {
            //Player turn use shooting unit is selected and target is enemy
            OnMPSelectionNeeded?.Invoke(this, new MPSelectionInfo()
            {
                callback = callback,
                enemyCallback = enemyCallback,
                MPAvailable = selectedUnit.GetMagicPoints(),
                enemyMPAvailable = targetUnit.GetMagicPoints()
            });
        }
        else
        {
            OnMPSelectionNeeded?.Invoke(this, new MPSelectionInfo()
            {
                callback = callback,
                enemyCallback = enemyCallback,
                MPAvailable = targetUnit.GetMagicPoints(),
                enemyMPAvailable = selectedUnit.GetMagicPoints()
            });
        }     
    }

This all seems to be fine except it runs into a problem here in the ShootAction:

case State.Aiming:
                state = State.Choosing;
                stateTimer = 0.1f;
                UnitActionSystem.Instance.RequestMPCost(ConfirmMPCost);
                break;

private void ConfirmMPCost(int value, int num)
    {
        Debug.Log($"MP = {value} and EnemyMP = {num}");

        NextState();
    }

My question is why can’t I use two values in RequestMPCost? It says
There is no argument given that corresponds to the required formal parameter 'enemyCallback' of 'UnitActionSystem.RequestMPCost(Action<int>, Action<int>)'

Why is that? I thought I set it up the same way.

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