Do you believe that box 12 of the W-2 is incorrect? If so, contact your employer for a corrected W-2.
IRS General Instructions for Form W-2, page 21, states:
Code AA
Designated Roth contributions under a section 401(k) plan. Use this code to report designated Roth contributions under a section 401(k) plan. Do not use this code to report elective deferrals under code D. S
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