You can't have any zeros entered on the form. If you have zeros, delete them and leave those fields blank. For any month you have a premium amount listed in column A, you will need to have an amount listed in column B. Column C fields can be left blank if they are empty on your 1095-A. Use the tool linked here: Health Coverage Tax Tool (Find column B amounts)
What message are you seeing after entering your 1095-A?
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