My FHSA contribution eligibility shows 0, however, it should be 8000. How to get that changed?

To do this in TurboTax Online for 2024, click on "2024 tax return" in the top left. Then search for "FHSA" and select “Opened first FHSA or prior year amounts” from the list. Then you’ll be able to enter the amounts from your 2023 notice of assessment or notice or reassessment, or your 2024 form T1028.