4cb68544__Capital_One___Credit_Line_FAQ__If_your_letter_says_
[What that means] Capital One does not provide credit line increases upon request to customers with an address outside of the 50 United States or Washington D.C. We do, however, consider accounts for credit line increases if your primary mailing address is a U.S. military address. [What you can do] If your address isn't up to date, please update your current address in our system. [If your letter says:] 
An address on your account is outside of the 50 United States, Washington, D.C., or a U.S. military location.
Credit Line Increase FAQ | Capital One - Credit Line FAQ
If your letter says: