This error usually happens due to a typing or spacing error, even though the SINs are different.
You may follow the steps below to fix the error:
1. Verify your spouse's SIN again for any additional spaces or digits that are inverted.
2. Go back to Personal Info, remove your spouse, save, then re-add them and re-enter the SIN.
3. Make sure your SIN is entered under your profile and your spouse’s SIN is entered under their profile (not both in the same field)
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