As a student in 2023? The 2023 T220A2 slip says I spent 8385.5 in tuition fees with 4 months. If I enter that in the 2023 refund, tax turbo says me refund is still 0, why

The tuition credit is a non-refundable tax credit that you can use to reduce the tax that you paid or may have to pay. It can’t be used to generate or increase a refund. So, if you don’t have any taxes payable, you will not get the credit.