If you are outside of Canada/US, unfortunately, they won't be able to contact you on your phone number. However, you can send them a message through the chat feature available on the bottom right of your income tax return. When you click on it, you can ask to speak to Assist & Review, which will show you different options to choose from. If none of the options help with your query, select "Chat to an A&R agent" and type in "Review my tax return" when prompted.

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