If you are using a TurboTax Online product, please follow the steps below to rectify name in your TurboTax profile
Sign in to your return
Go to the Find icon (magnifying glass) at the top right corner to enterPersonal Information- Name and Birth Date, then Click Go
Then you will be directed to a new page(Clients Name, let's get the rest of your personal info)
On this page, in the first section, you have options to rectify your personal information, also make sure you are mentioning the exact personal details that you have in your Canada Revenue Agency (CRA) profile.
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