The tool on Healthcare.gov has become active since you posted your question. Column B of Form 1095-A asks you to enter the second lowest cost Silver plan (SLCSP) premium amounts. To find the second lowest cost Silver plan premium amounts for you, use this tool at Healthcare.gov. The software won't accept zeroes in Column B.
For more information on Form 1095-A, please see this TurboTax tips article and this help article.
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