First, be sure to select your state of residence on the "Your Info" screen.
For your mailing address, if you are using a Military Address, be sure the zip matches the designation.
APO use AE for state and zip 09001
FPO use AP for state and zip 96606
APO use AA for state and zip 34035
If this is not the issue, please continue the question and add any details that might be helpful.
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