According to Canada Revenue Agency (CRA), Your repayment period starts the second year after the year when you first withdrew funds from your RRSP(s) for the HBP
You withdrew 35000 in 2020, so your first repayment should be in 2022 (2021 tax year)
For more information, please see the Canada Revenue Agency (CRA) link as When do you start making repayments?
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