Employer asking for child's SSN for IRS reporting of health insurance, do I need to give it?

As the title says, my employer is asking for me to provide the social security number of my child for the employer's IRS reporting (I'm assuming form 1095-B). My child is utilizing the employer-sponsored health insurance plan. I tried to google whether I am required to provide this, but not finding much. Obviously, I don't want to hand out any of our SSNs unless absolutely necessary. Anyone have some insight into the legal requirements of responding to such a request? …

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