If you are using TurboTax Online and are on the Contact Info page, please answer "Yes" to the question "Is your mailing address outside Canada?". You'll now be able to enter your information without getting errors.
If you are on the Payment Page, TurboTax Online only accepts Canadian or US Credit cards for payment, and therefore only accepts Canadian/US addresses on the payment screen.
If you don’t have a Canadian or US credit card, you can download our mobile app and then use Apple Pay or Google Pay to pay for your return. You can read more about our mobile app here: https://turbotax.intuit.ca/personal-tax-software/mobile-app.jsp