A Code DD in Box 12 of your W-2 is the amount your Employer paid for your Health Insurance. It is informational only and does not affect your personal return.
Any pre-tax insurance premiums you paid should already have been subtracted from your Wages in Box 1.
An amount on Schedule 1, Line 8t refers to a 'pension or annuity from a non-qualified deferred compensation plan' which would come from an entry in Box 11 on your W-2 and would be taxable income.
If this does not apply to you, you could delete and re-enter your W-2.
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