The program told me I am eligible to receive $300 for the Climate Action Incentive but it is not reflected on line 449 or the summary. Anyone have the same issue?

For 2020 and earlier, when you tell TurboTax that you live in a province that has the Climate Action Incentive (CAI), then that is added to the return when you enter the province. The amount may be removed or increased depending on the information that you add to the return, but it can also stay the same, which is why you may not see a change to your refund.