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I entered a valid SIN number for my daughter and it says it has to be different from mine and it is. All of our SINs are entered different.

 
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I entered a valid SIN number for my daughter and it says it has to be different from mine and it is. All of our SINs are entered different.

I'm sorry to hear that you are having this problem. To resolve this issue, select everything that is in your child's SIN box and delete it. Then re-type the SIN, making sure to use only numbers and no special characters or spaces. There should be total of 9 numbers.

Here is a list of Invalid characters: https://turbotax.community.intuit.ca/replies/2647899