ROTH TSP on W-2 Form Box 12 for an active member of the Militaryshow an amount within the TSP allowance, but greater than a traditional Roth IRA W-2 shows code AA. Turbo Tax only recognizes this as a Tradtional Roth and peanalizes for above $6,500

Turbo Tax is not recognizing this as a Roth TSP, which has a greater Contribution threshold.  The W-2 code shows as AA.

How do I get this actual contribution recognized as a TSP, and no penalty calculated based on the traditional Roth IRA limits?  The actual contribution and the code are on the W-2