Should alternative vehicle refueling property credit be 0, if I DO have a tax liability, and my AMT is 0 (cuz tentative is less than real taxes paid)? Not working for me.

It should be 30% of my costs applied as a credit.  But it keeps coming up as 0, even though my AMT is 0, and I DO have tax liability, meaning I owe taxes to the government, and I overpaid throughout the year and have a refund coming, but there IS a liability.  Why is my refueling property credit coming up as 0?