If you are using TurboTax Online and want to refile your return, you don't need to enter your activation code again. You just need to sign in to your TurboTax Online account for the tax year you want to prepare an adjustment for, and then select ReFILE beside the filed tax return you want to adjust.
You can login to TurboTax Canada Online 2022 here: https://ww1.2022.ca.turbotaxonline.intuit.com/
You can login to TurboTax Canada Online 2023 here: https://ww1.2023.ca.turbotaxonline.intuit.com/
You can login to TurboTax Canada Online 2024 here: https://ww1.2024.ca.turbotaxonline.intuit.com/