Yes, line 21A is the correct line number to report this. Codes like claim numbers, driver's license numbers, or certificate IDs are part of the XML data packet transmitted directly to the state. They are often "hidden" fields that do not appear on the PDF version of the return that you print for your records.
The claim number is usually embedded in an electronic "attachment" sent to the state but does not appear in the PDF printed version. If you see this on line 21A, it has been properly transmitted with the claim number safely embedded in the email transmission sent to the state.
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