The W-2 for 2020 with only an entry in Box 12 Code DD does not have to be reported on your 2021 tax return. It appears that the employer sent you the W-2 so that you have a record of how much the employer paid for your medical insurance.
You only need to report the W-2 for 2021, just keep the 2020 W-2 in your tax records.
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