Am I missing something here?

I sold a put AMD 210 Feb 6, So that's 21,000 CSP if I get assigned But it defaulted as Naked Put when I have Available to trade Margin buying power Fully marginable securities current:$240,898.44 Non-margin buying power Options, Mutual funds, Penny Stocks current:$120,449.22 Available without margin impact Amount you can use without borrowing on margin and incurring interest charges current:$47,680.79 47k is settled cash and it can clearly covered that put of 21k but it's showing Naked Put.