No. Your SSI benefits are not considered taxable income. You don't qualify for the full Child and Other Dependents Tax Credit because, even if you may have a qualifying child or children under age 17 who was eligible for the Child Tax Credit, your tax liability was $0. This means you couldn't use the full $2,000 Child Tax Credit to reduce your taxes.
Additionally, you didn't qualify for the refundable Additional Child Tax Credit because your earned income was less than $2,500. The Additional Child Tax Credit requires a minimum earned income of $2,500 to be eligible.
So while you have a qualifying child who could have gotten you the full $2,000 Child Tax Credit, your lack of tax liability and low earned income prevented you from receiving the full credit. You were only able to get a partial refundable credit of $1,700.
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