Although I am uncertain of taxation rules on the American side, I can surely advise you for Canadian tax returns. Dual citizenship is still required to file the Canadian tax return.
You firstly must ensure you are on the Canadian site:
Canadian TurboTax site : https://turbotax.intuit.ca/tax-software/index.jsp
- Two things to keep in mind when doing so, residency status - please see below:
Residency status when
preparing a return in TurboTax Canada
https://turbotax.community.intuit.ca/replies/2647682
- And how to enter in your foreign (USA) income because we have a tax treaty with them means you will not be double taxed on income sources:
How do I enter foreign
income that is subject to a tax treaty?
https://turbotax.community.intuit.ca/replies/2647756